Reconciliation of Shares Used to Determine Net Income per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share Disclosure [Line Items]
Net income (loss)	$ (108)	$ (9,115)	$ 360	$ (4,312)
Weighted average number of shares - basic	32,031,426	25,070,386	28,179,853	24,751,674
Weighted average number of shares outstanding - diluted	32,031,426	25,070,386	29,839,975	24,751,674
Warrants
Earnings Per Share Disclosure [Line Items]
Shares underlying	0	0	196,522	0
Options
Earnings Per Share Disclosure [Line Items]
Shares underlying	0	0	1,463,600	0