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Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Series A-1 Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 108 |
Exercise price per Share |  | $ 5,280.000 |
Expiration Date |  | 2020-10 |
Warrants Issued In September 2017 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 411 |
Exercise price per Share |  | $ 699.200 |
Expiration Date |  | 2023-03 |
Warrants Issued in June 2018 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 114,100 |
Exercise price per Share |  | $ 80.000 | $ 80.00
Expiration Date |  | 2023-06 |
Warrants Issued in October 2018 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 31,215 |
Exercise price per Share |  | $ 62.890 | $ 62.89
Expiration Date |  | 2023-10 |
Warrants Issued in May 2019 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 60,000 |
Exercise price per Share |  | $ 90.000 |
Expiration Date |  | 2025-05 |
Warrants Issued in December 2019 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 682,871 |
Exercise price per Share |  | $ 6.600 |
Expiration Date |  | 2024-12 |
Warrants Issued in April 2020 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 182,461 |
Exercise price per Share |  | $ 7.240 |
Expiration Date |  | 2025-04 |
Warrants Issued in April 2020 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 28,125 |
Exercise price per Share |  | $ 7.320 |
Expiration Date |  | 2025-04 |
Warrants Issued in April 2020 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 25,270 |
Exercise price per Share |  | $ 7.590 |
Expiration Date |  | 2025-04 |
Pre-Funded Warrants Issued in August 2020 [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Total Outstanding and Exercisable |  | 142,857 |
Exercise price per Share |  | $ 0.001 |
Expiration Date | [1] |  |
[1] | The pre-funded warrants do not have an expiration date.

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