Stock-Based Compensation - Summary of Company's Restricted Stock Activity and Related Information (Detail) |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
$ / shares
shares
| |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
| Shares, Unvested at beginning of period | shares | 22,830 |
| Shares, Granted | shares | 13,106 |
| Shares, Vested | shares | (23,291) |
| Shares, Forfeited | shares | 0 |
| Shares, Unvested at ending of period | shares | 12,645 |
| Weighted Average Grant Date Fair Value, Unvested at beginning of period | $ / shares | $ 6.47 |
| Weighted Average Grant Date Fair Value, Granted | $ / shares | 11.71 |
| Weighted Average Grant Date Fair Value, Vested | $ / shares | 6.49 |
| Weighted Average Grant Date Fair Value, Forfeited | $ / shares | 0 |
| Weighted Average Grant Date Fair Value, Unvested at end of period | $ / shares | $ 11.86 |