Warrants - Summary of Warrant Activity (Detail) - $ / shares |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2019 |
Dec. 31, 2018 |
|
| Class of Warrant or Right [Line Items] | ||
| Warrants, Beginning balance | 7,371,925 | 2,177,425 |
| Warrants, Granted | 19,166,668 | 14,700,000 |
| Warrants, Exercised | 0 | (9,505,500) |
| Warrants, Expired | 0 | 0 |
| Warrants, Ending balance | 26,538,593 | 7,371,925 |
| Weighted Average [Member] | ||
| Class of Warrant or Right [Line Items] | ||
| Weighted Average Price, Beginning balance | $ 1.74 | $ 3.10 |
| Weighted Average Price, Granted | 0.83 | 1.00 |
| Weighted Average Price, Exercised | 0 | 1.00 |
| Weighted Average Price, Expired | 0 | 0 |
| Weighted Average Price, Ending balance | $ 1.08 | $ 1.74 |
| X | ||||||||||
- Definition Number of warrants exercised in period. No definition available.
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- Definition The exercise price of the class of warrants exercised in the period. No definition available.
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- Definition Number of warrants expired in period. No definition available.
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- Definition The exercise price of the class of warrants that expired during the period. No definition available.
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- Definition Number of warrants granted in period. No definition available.
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- Definition The exercise price of warrants granted in the period No definition available.
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- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Number of warrants or rights outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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