Stock Based Awards - Stock Options Outstanding and Exercisable under Stock Option Plans (Detail)
|
12 Months Ended |
|
Dec. 31, 2016
$ / shares
shares
|
|---|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Options Outstanding, Number |
4,452,700
|
| Options Exercisable and Vested, Outstanding Number |
2,246,742
|
| $1.27 - $2.53 [Member] |
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Range of Exercise Price, Lower Limit | $ / shares |
$ 1.27
|
| Range of Exercise Price, Upper Limit | $ / shares |
$ 2.53
|
| Options Outstanding, Number |
1,158,038
|
| Options Outstanding, Weighted Average Remaining Contractual Life (Years) |
6 years 3 months 18 days
|
| Options Exercisable and Vested, Outstanding Number |
966,139
|
| Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) |
6 years 3 months 18 days
|
| $3.33 - $10.68 [Member] |
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Range of Exercise Price, Lower Limit | $ / shares |
$ 3.33
|
| Range of Exercise Price, Upper Limit | $ / shares |
$ 10.68
|
| Options Outstanding, Number |
1,736,950
|
| Options Outstanding, Weighted Average Remaining Contractual Life (Years) |
8 years 7 months 6 days
|
| Options Exercisable and Vested, Outstanding Number |
494,703
|
| Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) |
8 years 7 months 6 days
|
| $10.87 - $20.30 [Member] |
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Range of Exercise Price, Lower Limit | $ / shares |
$ 10.87
|
| Range of Exercise Price, Upper Limit | $ / shares |
$ 20.30
|
| Options Outstanding, Number |
896,382
|
| Options Outstanding, Weighted Average Remaining Contractual Life (Years) |
8 years 6 months
|
| Options Exercisable and Vested, Outstanding Number |
409,602
|
| Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) |
8 years 6 months
|
| $21.00 - $31.96 [Member] |
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Range of Exercise Price, Lower Limit | $ / shares |
$ 21.00
|
| Range of Exercise Price, Upper Limit | $ / shares |
$ 31.96
|
| Options Outstanding, Number |
651,330
|
| Options Outstanding, Weighted Average Remaining Contractual Life (Years) |
7 years 6 months
|
| Options Exercisable and Vested, Outstanding Number |
370,048
|
| Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) |
7 years 6 months
|
| $34.00 [Member] |
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
| Range of Exercise Price, Lower Limit | $ / shares |
$ 34.00
|
| Range of Exercise Price, Upper Limit | $ / shares |
$ 34.00
|
| Options Outstanding, Number |
10,000
|
| Options Outstanding, Weighted Average Remaining Contractual Life (Years) |
7 years 6 months
|
| Options Exercisable and Vested, Outstanding Number |
6,250
|
| Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) |
7 years 6 months
|