Summary of Significant Accounting Policies - Reconciliation of Shares Used to Determine Net Income per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share Disclosure [Line Items]
Net income	$ 4,789	$ 1,082	$ 12,562	$ 5,786
Weighted average number of shares - basic	33,873,479	32,639,429	33,265,470	32,487,230
Weighted average number of shares outstanding - diluted	35,297,585	33,856,045	34,341,930	34,071,982
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	0	176,775	0	332,269
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	1,424,106	1,039,841	1,076,460	1,252,483