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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic and diluted net loss per share (in thousands, except per share amounts):
Net loss	$ (21,741)	$ (34,694)	$ (28,986)	$ (27,023)	$ (26,862)	$ (30,124)	$ (23,591)	$ (26,217)	$ (112,444)	$ (106,794)	$ (90,722)
Denominator for basic and diluted net loss per share:
Weighted-average common shares outstanding	38,544	38,512	38,496	38,472	38,429	36,532	29,335	27,065	38,506	32,881	26,289
Basic and diluted net loss per share	$ (0.56)	$ (0.90)	$ (0.75)	$ (0.70)	$ (0.70)	$ (0.82)	$ (0.80)	$ (0.97)	$ (2.92)	$ (3.25)	$ (3.45)
Outstanding securities not included in diluted net loss per share calculation (in thousands):
Outstanding securities not included in diluted net loss per share calculation									4,673	3,086	7,422
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
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									4,673	3,086	1,998
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

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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