Reconciliation of Shares Used to Determine Net Income per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Disclosure [Line Items]
Net income	$ 308	$ 334	$ 468	$ 4,803
Weighted average number of shares - basic	26,267,746	24,891,115	25,679,066	24,605,541
Weighted average number of shares outstanding - diluted	27,846,672	26,859,009	27,357,936	26,670,232
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	155,833	383,123	206,105	432,705
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	1,423,093	1,584,771	1,472,765	1,631,986