Stock-Based Compensation - Schedule of Share-based Compensation, Restricted Stock Unit, Activity (Detail) - Restricted Stock Units [Member]
|
9 Months Ended |
|
Sep. 30, 2016
$ / shares
shares
|
|---|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
|
| Unvested Number of Shares, Beginning Balance | shares |
275,500
|
| Number of Shares, Granted | shares |
205,000
|
| Number of Shares, Cancelled | shares |
(40,000)
|
| Unvested Number of Shares, Ending Balance | shares |
440,500
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
|
| Unvested Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares |
$ 24.43
|
| Weighted Average Grant Date Fair Value, Granted | $ / shares |
14.04
|
| Weighted Average Grant Date Fair Value, Cancelled | $ / shares |
19.96
|
| Unvested Weighted Average Grant Date Fair Value, Ending Balance | $ / shares |
$ 20.00
|