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 |