Summary of Significant Accounting Policies - Reconciliation of Shares Used to Determine Net Income per Share (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share Disclosure [Line Items]
Net income	$ 2,944	$ 1,893
Weighted average number of shares outstanding - basic	32,888,659	32,333,443
Weighted average number of shares outstanding - diluted	33,944,876	34,280,385
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	175,285	378,780
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	880,932	1,568,162