Stockholders' Equity - Summary of Non-Vested Options (Detail) shares in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
$ / shares
shares
| |
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | |
| Shares, Non-vested, Beginning balance | shares | 450 |
| Shares, Vested | shares | (276) |
| Shares, Forfeited | shares | (41) |
| Shares, Non-vested, Ending balance | shares | 133 |
| Weighted-average grant-date fair value, Non-vested, Beginning balance | $ / shares | $ 1.16 |
| Weighted-average grant-date fair value, Vested | $ / shares | 1.09 |
| Weighted-average grant-date fair value, Forfeited | $ / shares | 1.45 |
| Weighted-average grant-date fair value, Non-vested, Ending balance | $ / shares | $ 1.19 |