Net (Loss) Income Per Common Share - Schedule of Computation of Dilutive Effect, Calculated to Indicate Impact of Net Income and Anti-Dilutive Common Stock Equivalents (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Numerator for diluted net (loss) income per share:
Net income (loss)	$ (1,299)	$ (878)	$ 12,643	$ (7,178)	$ 338
Preferred deemed dividend			(9,455)
Less: Net (loss) income attributed to participating securities	(9)	(4)	21	(36)
Net (loss) income attributable to common shareholders, net of (loss) income attributable to participating securities	$ (1,290)	$ (874)	$ 3,167	$ (7,142)
Denominator for diluted net (loss) income per share:
Weighted-average shares outstanding	202,343,245	201,514,133	202,163,250	201,276,741
Weighted-average unvested restricted shares outstanding	(1,343,764)	(1,128,769)	(1,336,982)	(1,000,070)
Effect of dilutive potential shares *			37,045,988
Shares used in computing diluted net (loss) income per share	200,999,481	200,385,364	237,872,256	200,276,671
Diluted net income (loss) per share attributable to common shareholders	$ (0.01)	$ 0.00	$ 0.01	$ (0.04)