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Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 19, 2018
Class of Warrant or Right [Line Items] |  |  |
Exercise price per Share |  |  | $ 4.00
Series A-1 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable | 2,175 |  |
Exercise price per Share | $ 264.0000 |  |
Expiration Date | 2020-10 |  |
Warrants Issued In September 2017 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable | 8,224 |  |
Exercise price per Share | $ 34.9600 |  |
Expiration Date | 2023-03 |  |
Warrants Issued In June 2018 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable | 2,282,000 |  |
Exercise price per Share | $ 4.0000 | $ 4.00 |
Expiration Date | 2023-06 |  |
Warrants Issued in October 2018 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable | 624,313 |  |
Exercise price per Share | $ 3.1445 |  |
Expiration Date | 2023-10 |  |
Warrants Issued in May 2019 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable | 1,200,000 |  |
Exercise price per Share | $ 4.5000 |  |
Expiration Date | 2025-05 |  |

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