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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, 2016
 [1]
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2015
 [1]
Sep. 30, 2015
 [1]
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [1]
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator                      
Net loss, basic Continuing operations $ (10,081) $ (10,063) $ (1,909) $ (4,248) $ (6,463) $ (156,998) $ (4,190) $ (3,599) $ (26,301) $ (171,253) $ (98)
Decrease in fair value of warrants                     (2,578)
Diluted net loss attributable to common stockholders, Continuing operations                 (26,301) (171,253) (2,676)
Net loss, basic Discontinuing operations $ 5,727 $ (3,658) $ (3,324) $ (2,369) $ (3,440) $ (3,267) $ 243 $ (963) (3,624) (7,423) (12,784)
Diluted net loss attributable to common stockholders, Discontinued operations                 $ (3,624) $ (7,423) $ (12,784)
Denominator                      
Weighted average common shares outstanding                 8,646 8,365 8,178
Weighted average unvested common shares subject to repurchase                 (64) (68) (66)
Weighted average common shares outstanding - basic                 8,582 8,298 8,112
Effect of dilutive securities:                      
Common stock warrants                     32
Weighted average common shares outstanding, diluted                 8,582 8,298 8,145
Basic net loss per share, Continuing operation                 $ (3.06) $ (20.64) $ (0.01)
Diluted net loss per share, Continuing operation                 (3.06) (20.64) (0.33)
Basic net loss per share, Discontinuing operation                 (0.42) (0.89) (1.58)
Diluted net loss per share, Discontinuing operation                 $ (0.42) $ (0.89) $ (1.57)
[1] Selected quarterly financial data for periods prior to the nine months ended September 30, 2016 have been recast to reflect discontinued operations.