Warrants - Summary of Warrant Activity (Detail) - $ / shares |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Apr. 06, 2018 |
Jun. 30, 2018 |
Dec. 31, 2017 |
|
| Class of Warrant or Right [Line Items] | |||
| Warrants, Beginning balance | 2,177,425 | 17,559 | |
| Warrants, Granted | 900,000 | 900,000 | 2,177,425 |
| Warrants, Exercised | 0 | 0 | |
| Warrants, Expired | (17,559) | ||
| Warrants, Ending balance | 3,077,425 | 2,177,425 | |
| Weighted Average Price, Granted | $ 2 | ||
| 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 | 2.00 | 3.10 | |
| Weighted Average Price, Exercised | 0 | 0 | |
| Weighted Average Price, Expired | 1.50 | ||
| Weighted Average Price, Ending balance | $ 2.78 | $ 3.10 |