Net (Loss) Income Per Common Share - Computation of Basic Net Income (Loss) Per Share (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 basic 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 basic 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)
Denominator for basic net (loss) income per share:	200,999,481	200,385,364	200,826,268	200,276,671
Basic net (loss) income per share attributable to common shareholders	$ (0.01)	$ 0.00	$ 0.02	$ (0.04)