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Summary of Significant Accounting Policies - Weighted Average Number of Common Shares Outstanding (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
Numerator:                      
Net loss for basic earnings per share $ (9,903) $ (160,265) $ (3,947) $ (4,561) $ (273) $ (3,041) $ (2,895) $ (6,673) $ (178,676) $ (12,882) $ (82,227)
Decrease in fair value of warrants                 0 (2,578) 0
Diluted net loss attributable to common stockholders                 $ (178,676) $ (15,460) $ (82,227)
Denominator:                      
Weighted average common shares outstanding                 100,385 98,138 97,111
Weighted average unvested common shares subject to repurchase                 (811) (791) (876)
Weighted average common shares outstanding—basic                 99,574 97,347 96,235
Effect of dilutive securities:                      
Conversion of preferred stock, shares                 0 0 0
Options, shares                 0 0 0
Warrants, shares                   388  
Weighted average common shares outstanding—diluted                 99,574 97,735 96,235
Net loss per share:                      
Basic (in dollars per share) $ (0.10) [1] $ (1.61) [1] $ (0.04) [1] $ (0.05) [1] $ 0.00 [1] $ (0.03) [1] $ (0.03) [1] $ (0.07) [1] $ (1.79) $ (0.13) $ (0.85)
Diluted (in dollars per share) $ (0.10) [1] $ (1.61) [1] $ (0.04) [1] $ (0.05) [1] $ (0.03) [1] $ (0.04) [1] $ (0.03) [1] $ (0.07) [1] $ (1.79) $ (0.16) $ (0.85)
[1] Basic and diluted net loss per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts will not necessarily equal the total for the year.