Share-Based Compensation - Additional Information (Details)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Aug. 31, 2015
shares
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Sep. 30, 2015
$ / shares
shares
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Jun. 30, 2014
employee
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Mar. 31, 2014 |
Jun. 30, 2013
employee
|
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
|
Dec. 31, 2014
USD ($)
employee
$ / shares
shares
|
Dec. 31, 2013
USD ($)
event
employee
$ / shares
shares
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Aug. 07, 2015
$ / shares
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Dec. 31, 2012
shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of stock incentive plans | plan |
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2
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| Aggregate number of shares subject to outstanding options and RSAs under both plans |
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16,012,417
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| Award expiration period |
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10 years
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| Exercise of vested stock options (in shares) |
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1,374,438
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0
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9,400
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| Restricted stock awarded (in shares) |
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683,401
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| Outstanding options (in shares) |
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15,260,266
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19,924,405
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20,540,273
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17,707,139
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| Unrecognized share-based compensation expense | $ |
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$ 47,200,000
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$ 42,800,000
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$ 43,300,000
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| Unrecognized stock-based compensation expense, weighted-average recognition period |
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2 years 10 months 12 days
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3 years 2 months 12 days
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2 years 9 months 18 days
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| Weighted-average grant date fair value of options granted (in dollars per share) | $ / shares |
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$ 2.78
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$ 4.40
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$ 5.19
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| Total intrinsic value of options exercised | $ |
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$ 4,900,000
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$ 0
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$ 100,000
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| Total fair value of options vested | $ |
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$ 14,900,000
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$ 22,900,000
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$ 27,100,000
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| Options granted (in shares) |
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2,231,504
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4,406,856
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8,345,437
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| Weighted-average exercise price, granted (in dollars per share) | $ / shares |
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$ 5.60
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$ 8.78
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$ 10.09
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| Number of employees terminated | event |
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2
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| Net increase in share-based compensation as a result of stock awards modification | $ |
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$ 3,100,000
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| Non Employee Consultant |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted (in shares) |
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125,779
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109,887
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265,517
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| Weighted-average exercise price, granted (in dollars per share) | $ / shares |
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$ 15.67
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$ 17.12
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$ 20.05
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| Employee Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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4 years
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| Awards vesting percentage |
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25.00%
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| Exercise of vested stock options (in shares) |
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0
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0
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0
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| Employee Stock Option | Key Employees |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Outstanding options (in shares) |
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7,103,801
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7,103,801
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| Employee Stock Option | Tranche Two |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Employee Stock Option | Tranche Three |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Employee Stock Option | Tranche Four |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Non Employee Stock Option | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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1 year
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| Non Employee Stock Option | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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4 years
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| Non Employee Stock Option | Tranche One |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Non Employee Stock Option | Tranche Two |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Non Employee Stock Option | Tranche Three |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Non Employee Stock Option | Tranche Four |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
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| Non-Qualified Options | Key Employees |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock granted (in shares) |
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3,400,000
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4,703,801
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| Restricted Stock Awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
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4 years
|
|
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| Restricted stock awarded (in shares) |
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|
8,994,729
|
2,365,000
|
508,303
|
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| Fair value of restricted stock vested in period | $ |
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|
$ 9,900,000
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$ 1,500,000
|
$ 600,000
|
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| Shares paid for tax withholding for share-based compensation (in shares) |
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|
441,537
|
45,142
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16,623
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| Shares paid for tax withholding for share-based compensation, cost | $ |
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$ 1,600,000
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$ 400,000
|
$ 200,000
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| Treasury stock purchases (in shares) |
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533,427
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| Treasury stock due to canceled RSA (in shares) |
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324,213
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218,750
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160,220
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| Vesting triggering event, percent of average share price to grant date stock price |
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200.00%
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| Restricted Stock Awards | Key Employees |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Restricted stock awarded (in shares) |
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|
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|
1,000,000
|
400,000
|
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| Restricted stock (in shares) |
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1,399,980
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1,749,988
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| Restricted Stock Awards | Chief Executive Officer |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares granted |
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500,000
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| Restricted Stock Awards | Tranche One |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
|
|
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| Restricted Stock Awards | Tranche Two |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
|
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| Restricted Stock Awards | Tranche Three |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
|
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| Restricted Stock Awards | Tranche Four |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Awards vesting percentage |
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25.00%
|
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| Amended and Restated 2010 Stock Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Additional shares authorized |
5,000,000
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| 2010 Stock Incentive Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum number of shares issuable under plan |
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29,374,756
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| Number of shares available for future grants under the 2010 plan |
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5,148,848
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| Plan Modification Due to Restructuring Plans |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of employees terminated | employee |
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|
13
|
|
|
|
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|
| Net increase in share-based compensation as a result of stock awards modification | $ |
|
|
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$ 1,100,000
|
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| Plan Modification Due to Restructuring Plans | Senior Executive |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Extension of the exercise period for vested options before plan modification |
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60 days
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| Net increase in share-based compensation as a result of stock awards modification | $ |
|
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|
$ 5,600,000
|
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| Extension of the exercise period for vested options, after the effective period of registration statement |
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60 days
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| Plan Modification Due to Restructuring Plans | Employee Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Extension of the exercise period for vested options before plan modification |
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60 days
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| Extension of the exercise period for vested options after plan modification |
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|
60 days
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| Net increase in share-based compensation as a result of stock awards modification | $ |
|
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|
2,300,000
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| Number of employees affected by modification of share-based awards | employee |
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|
39
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13
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| Extension of the exercise period for vested options, after the effective period of registration statement |
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|
60 days
|
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| Plan Modification Due to Transition of CEO Role |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Net increase in share-based compensation as a result of stock awards modification | $ |
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|
100,000
|
$ 1,500,000
|
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| Plan Modification Due to Transition of CEO Role | Employee Stock Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Extension of the exercise period for vested options before plan modification |
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60 days
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| Extension of the exercise period for vested options after plan modification |
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10 years
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| Plan Modification Due to Retention Equity Awards Granted to COO |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Net increase in share-based compensation as a result of stock awards modification | $ |
|
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|
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|
$ 600,000
|
900,000
|
|
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| Plan Modification Due to Modification of Award Terms Granted to COO |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
|
|
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| Net increase in share-based compensation as a result of stock awards modification | $ |
|
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|
|
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|
$ 200,000
|
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| Plan Modification Due to Modification of Award Terms Granted to COO | Employee Stock Option | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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|
|
|
|
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| Extension of the exercise period for vested options after plan modification |
|
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|
60 days
|
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| Plan Modification Due to Modification of Award Terms Granted to COO | Employee Stock Option | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Extension of the exercise period for vested options after plan modification |
|
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2 years
|
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| Plan Modification Due to Cash Settlement of Awards |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
|
|
|
|
|
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| Net increase in share-based compensation as a result of stock awards modification | $ |
|
|
|
|
|
|
$ 900,000
|
|
|
|
| Number of employees affected by modification of share-based awards | employee |
|
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|
3
|
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| Two Thousand Fourteen Bonus Plan RSA [Member] |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
| Net increase in share-based compensation as a result of stock awards modification | $ |
|
|
|
|
|
$ 1,800,000
|
|
|
|
|
| Two Thousand Fourteen Bonus Plan RSA [Member] | Restricted Stock Awards |
|
|
|
|
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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|
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| Deferred Compensation Arrangement with Individual, Distributions Paid, Amount Per Share | $ / shares |
|
$ 2.66
|
|
|
|
|
|
|
|
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| Restricted Stock, Trading Price Per Share | $ / shares |
|
$ 5.38
|
|
|
|
|
|
|
$ 2.72
|
|