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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member] - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units outstanding, Number of Shares, Beginning Balance 71,752 63,330 41,663
Restricted stock units granted, Number of Shares 47,000 739,000 43,500
Restricted stock units vested, Number of Shares (45,750) (42,078) (20,833)
Restricted stock units forfeited, Number of Shares (8,500) (3,500) (1,000)
Unvested restricted stock units outstanding, Number of Shares, Ending Balance 64,502 71,752 63,330
Restricted stock units outstanding, Weighted Average Award Date Fair Value per Share, Beginning Balance $ 8.49 $ 8.51 $ 6.00
Restricted stock units granted, Weighted Average Award Date Fair Value per Share 6.67 7.96 9.65
Restricted stock units vested, Weighted Average Award Date Fair Value per Share 8.69 7.82 6.00
Restricted stock units forfeited, Weighted Average Award Date Fair Value per Share 7.20 8.68 6.00
Unvested restricted stock units outstanding, Weighted Average Award Date Fair Value per Share, Ending Balance $ 7.19 $ 8.49 $ 8.51