Common Stock - Common Stock Warrants - Additional Information (Detail) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||
| Number of warrants exercised | 0 | 0 |
| X | ||||||||||
- Definition Number of warrants exercised. No definition available.
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| X | ||||||||||
- References No definition available.
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