Stockholders' Equity - RSU Activity and Related Information (Detail) - Restricted Stock Units
|
12 Months Ended |
|
Dec. 31, 2015
$ / shares
shares
|
|---|
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |
|
| Outstanding balance, Shares | shares |
1,404,274
|
| Granted, Shares | shares |
1,990,172
|
| Vested, Shares | shares |
(1,346,472)
|
| Forfeited, Shares | shares |
(93,469)
|
| Outstanding balance, Shares | shares |
1,954,505
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
|
| Outstanding balance, Weighted-Average Grant-Date Fair Value (in USD per share) | $ / shares |
$ 10.28
|
| Granted, Weighted-Average Grant-Date Fair Value (in USD per share) | $ / shares |
3.04
|
| Vested, Weighted-Average Grant-Date Fair Value (in USD per share) | $ / shares |
7.29
|
| Forfeited, Weighted-Average Grant-Date Fair Value (in USD per share) | $ / shares |
8.02
|
| Outstanding balance, Weighted-Average Grant-Date Fair Value (in USD per share) | $ / shares |
$ 5.01
|