Warrants - Summary of Warrant Activity (Detail) - $ / shares |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jul. 17, 2018 |
Apr. 06, 2018 |
Sep. 30, 2018 |
Dec. 31, 2017 |
|
| Class of Warrant or Right [Line Items] | ||||
| Warrants, Beginning balance | 2,177,425 | 17,559 | ||
| Warrants, Granted | 13,800,000 | 900,000 | 14,700,000 | 2,177,425 |
| Warrants, Exercised | 0 | 0 | ||
| Warrants, Expired | (17,559) | |||
| Warrants, Ending balance | 16,877,425 | 2,177,425 | ||
| Weighted Average Price, Granted | $ 2.00 | |||
| Weighted Average Price, Ending balance | $ 2.00 | |||
| Weighted Average [Member] | ||||
| Class of Warrant or Right [Line Items] | ||||
| Weighted Average Price, Beginning balance | $ 3.10 | $ 1.50 | ||
| Weighted Average Price, Granted | 1.06 | 3.10 | ||
| Weighted Average Price, Exercised | 0 | 0 | ||
| Weighted Average Price, Expired | 1.50 | |||
| Weighted Average Price, Ending balance | $ 1.32 | $ 3.10 |