Annual report pursuant to Section 13 and 15(d)

Share-based Compensation - Summary of Restricted Share Activity, Excluding Company's Employee Stock Purchase Plan (Detail)

v3.6.0.2
Share-based Compensation - Summary of Restricted Share Activity, Excluding Company's Employee Stock Purchase Plan (Detail) - Restricted Stock [Member] - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested Number of Shares, Beginning Balance 170,832 256,003
Number of Shares, Granted 0 61,663
Number of Shares, Vested (64,182) (83,029)
Vested shares forgone to satisfy minimum statutory withholding (16,484) (24,031)
Number of Shares, Forfeitures (32,833) (39,774)
Unvested Number of Shares, Ending Balance 57,333 170,832
Unvested Weighted average grant date fair value, Beginning Balance $ 2.09 $ 1.78
Weighted average grant date fair value, Granted   2.60
Weighted average grant date fair value, Vested 1.74 1.53
Weighted average grant date fair value, Vested shares forgone to satisfy minimum statutory withholding 2.81 2.96
Weighted average grant date fair value, Forfeitures 2.18 1.79
Unvested Weighted average grant date fair value, Ending Balance $ 2.21 $ 2.09
Aggregate fair value, Vested $ 236,161 $ 244,319
Aggregate fair value, Vested shares forgone to satisfy minimum statutory withholding $ 49,592 $ 71,445