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Loss Per Common Share - Schedule of Basic and Diluted Loss Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Numerator:    
Net loss $ (16,208) $ (32,024)
Net Loss attributable to Series A Preferred Stock (2,345)  
Numerator for basic EPS-Earnings (loss) attributable to common stockholders (13,863) (32,024)
Effect of dilutive securities:    
Deduct change in fair value of warrant liability (17,507)  
Numerator for diluted EPS-Earnings (loss) attributable to common stockholders after assumed conversions $ (31,370) $ (32,024)
Denominator:    
Weighted-average number of common shares used in earnings (loss) per share-basic 14,256,954 13,231,126
Effect of dilutive securities:    
Nonparticipating warrants 132,238  
Denominator for diluted EPS-adjusted weighted average shares 14,389,192 13,231,126
Earnings (loss) per share-basic $ (0.97) $ (2.42)
Earnings (loss) per share-diluted $ (2.18) $ (2.42)