Stock Based Awards - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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May 31, 2015 |
Feb. 28, 2009 |
Jun. 30, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Mar. 31, 2014 |
Mar. 20, 2014 |
Dec. 31, 2013 |
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Number of shares reserved |
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5,998,840
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4,845,579
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| Common stock reserved for future issuance |
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1,044,113
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1,350,543
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991,401
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9,533
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| Intrinsic value of stock option exercised |
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$ 800,000
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$ 1,400,000
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$ 800,000
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| Unrecognized employee stock-based compensation |
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$ 20,000,000
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| Weighted-average remaining vesting period |
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2 years 3 months 18 days
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| Unvested stock options expected to vest, term |
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7 years 9 months 18 days
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| Additional shares issued |
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1,323,911
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1,091,045
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2,531,915
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| Voting power per share |
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One
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| Recognized compensation expense |
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$ 10,923,000
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$ 10,699,000
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$ 4,641,000
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| Weighted Average Remaining Contractual Life, Options outstanding |
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7 years 9 months 18 days
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| Co-Founder And CEO [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Separation related costs |
$ 2,400,000
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| Unexercised vested and expected to vest stock options |
$ 2,000,000
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| Unvested stock options expected to vest, term |
12 months
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| Incremental payroll costs |
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$ 400,000
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| Employee Stock Option [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Options vesting period |
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4 years
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| Stock options, weighted-average grant date fair value |
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$ 6.78
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$ 10.62
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$ 16.90
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| Tax benefits realized from options and other share-based payment arrangements |
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$ 0
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$ 0
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$ 0
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| Restricted stock units [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Recognized compensation expense |
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2,000,000
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$ 1,400,000
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$ 500,000
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| Approximate compensation expenses |
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$ 4,100,000
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| Weighted Average Remaining Contractual Life, Options outstanding |
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2 years 6 months
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| 2009 Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Options vesting period |
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4 years
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| Options vested , description |
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Options granted generally vest over four years and vest at a rate of 25% upon the first anniversary of the issuance date and 1/36th?per month thereafter
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| 2014 Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Options vesting period |
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4 years
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| Options expiration period |
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10 years
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| Options vested , description |
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Options granted under the 2014 Plan have a contractual life of ten years and generally vest over four years and vest at a rate of 25% upon the first anniversary of the issuance date and 1/36th per month thereafter.
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| Number of shares reserved |
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4,100,000
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| Percentage of common stock issued and outstanding increase annually |
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4.50%
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| End date of automatic annual increase of shares reserved for issuance |
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Jan. 01, 2024
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| Common stock reserved for future issuance |
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1,044,113
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| 2014 Plan [Member] | Incentive Stock Option [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Number of shares reserved |
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12,000,000
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| Employee Stock Purchase Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Number of shares reserved |
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150,000
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| Percentage of common stock issued and outstanding increase annually |
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1.00%
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| End date of automatic annual increase of shares reserved for issuance |
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Jan. 01, 2024
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| Additional shares issued |
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300,000
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| Voting power per share |
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Immediately after the grant would own stock possessing 5% or more of the total combined voting power or value of our common stock.
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| Percentage of stock possessing |
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5.00%
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| Rights to purchase stock that remains outstanding |
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$ 25,000
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| Offerings of purchase periods |
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27 months
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| Maximum employee subscription rate |
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15.00%
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| Maximum [Member] | 2009 Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Options expiration period |
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10 years
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| Minimum [Member] | 2009 Plan [Member] | Incentive Stock Option [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Price of options granted, percentage |
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100.00%
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| Minimum [Member] | 2009 Plan [Member] | 10% Shareholders [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Price of options granted, percentage |
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110.00%
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| Minimum [Member] | 2014 Plan [Member] | Incentive Stock Option [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Price of options granted, percentage |
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100.00%
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| Minimum [Member] | Employee Stock Purchase Plan [Member] |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Price of options granted, percentage |
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85.00%
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