Net Income (Loss) per Share of Common Stock - Computation of Diluted Net (Loss) Income per Share of Common Stock (Detail) - shares shares in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Stock options to purchase common stock and restricted stock units [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Dilutive securities excluded from computation of diluted net (loss) income per share | 2,587 | 2,497 |