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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member] - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of units, Granted 339,426
Number of units, Vested (180,090)
Number of units, Forfeited or expired 0
Number of Units, Ending Balance 159,336
Weighted average grant date fair value, Granted $ 12.43
Weighted average grant date fair value, Vested 12.65
Weighted average grant date fair value, outstanding $ 12.18
Total grant date fair value, Granted $ 4,220
Total grant date fair value, Vested (2,278)
Total grant date fair value, Outstanding, Ending balance $ 1,942