Summary of Significant Accounting Policies - Reconciliation of Shares Used to Determine Net Income per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share Disclosure [Line Items]
Net income	$ 4,830	$ 2,811	$ 7,774	$ 4,704
Weighted average number of shares - basic	33,128,518	32,542,672	33,008,588	32,454,175
Weighted average number of shares outstanding - diluted	34,270,337	34,383,092	34,045,125	34,254,901
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	156,244	406,840	129,351	393,064
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	985,575	1,433,580	907,186	1,407,662