Stockholders' Equity - Restricted Stock Award and Restricted Stock Unit Activity (Detail)
shares in Thousands |
12 Months Ended |
|
Dec. 31, 2016
$ / shares
shares
|
|---|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
|
| Beginning Balance, Awarded and unvested, Number of units outstanding (in shares) | shares |
329
|
| Granted, Number of units outstanding (in shares) | shares |
543
|
| Vested, Number of units outstanding (in shares) | shares |
(190)
|
| Forfeited and cancelled, Number of units outstanding (in shares) | shares |
(242)
|
| Ending Balance, Awarded and unvested, Number of units outstanding (in shares) | shares |
440
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
|
| Beginning Balance, Awarded and unvested, Weighted average grant date fair value per unit (in dollars per share) | $ / shares |
$ 4.40
|
| Granted, Weighted average grant date fair value per unit (in dollars per share) | $ / shares |
3.52
|
| Vested, Weighted average grant date fair value per unit (in dollars per share) | $ / shares |
4.05
|
| Forfeited and cancelled, Weighted average grant date fair value per unit (in dollars per share) | $ / shares |
4.01
|
| Ending Balance, Awarded and unvested, Weighted average grant date fair value per unit (in dollars per share) | $ / shares |
$ 3.69
|