Reconciliation of Shares Used to Determine Net Income per Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Disclosure [Line Items]
Net income	$ 2,811	$ 308	$ 4,704	$ 468
Weighted average number of shares - basic	32,542,672	26,267,746	32,454,175	25,679,066
Weighted average number of shares outstanding - diluted	34,383,092	27,846,672	34,254,901	27,357,936
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	406,840	155,833	393,064	206,105
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	1,433,580	1,423,093	1,407,662	1,472,765