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Stockholders' Equity and Dilutive Equity Instruments - Additional Information (Detail) - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
In-the-money Warrants and Restricted Stock Awards and Units    
Stockholders Equity Note [Line Items]    
Incremental "in-the-money" warrants, and restricted stock awards and units 3,397,110 5,143,206
Out-of-the-money Warrants    
Stockholders Equity Note [Line Items]    
Warrants outstanding 5,923,399 5,062,089
Out-of-the-money Warrants | Series A Warrants    
Stockholders Equity Note [Line Items]    
Warrants exercise prices $ 57.06 $ 57.06
Out-of-the-money Warrants | Series B Warrants    
Stockholders Equity Note [Line Items]    
Warrants exercise prices 62.28 62.28
Out-of-the-money Warrants | GLF Equity Warrants    
Stockholders Equity Note [Line Items]    
Warrants exercise prices $ 100 $ 100