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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
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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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