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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic and diluted net loss per share (in thousands, except per share amounts):
Net loss	$ (26,862)	$ (30,124)	$ (23,591)	$ (26,217)	$ (22,286)	$ (29,819)	$ (24,777)	$ (13,840)	$ (106,794)	$ (90,722)	$ (66,720)
Preferred stock deemed dividend											(8,469)
Net loss allocable to common stockholders	$ (26,862)	$ (30,124)	$ (23,591)	$ (26,217)	$ (22,286)	$ (29,819)	$ (24,777)	$ (13,840)	$ (106,794)	$ (90,722)	$ (75,189)
Denominator for basic and diluted net loss per share allocable to common stockholders:
Weighted-average common shares outstanding	38,429	36,532	29,335	27,065	26,298	26,291	26,286	26,283	32,881	26,289	19,628
Net loss per share allocable to common stockholders - basic and diluted	$ (0.70)	$ (0.82)	$ (0.80)	$ (0.97)	$ (0.85)	$ (1.13)	$ (0.94)	$ (0.53)	$ (3.25)	$ (3.45)	$ (3.83)
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									3,086	7,422	7,293
Series B Convertible Preferred Stock
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation										4,343	4,343
Stock Options and Stock Awards
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									3,086	1,998	1,704
Warrant
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation										1,081	1,246

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