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Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jun. 19, 2018
Class of Warrant or Right [Line Items] |  |  |  |
Exercise price per Share |  |  |  | $ 80.00
Warrants Issued In September 2017 [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Total Outstanding and Exercisable |  | 411 |  |
Exercise price per Share |  | $ 699.2000 |  |
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 |  | $ 80.0000 | $ 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 |  | $ 62.8900 | $ 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 |  | $ 90.0000 |  |
Expiration Date |  | 2025-05 |  |
Warrants Issued in December 2019 [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Total Outstanding and Exercisable |  | 660,050 |  |
Exercise price per Share |  | $ 6.6000 |  |
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 |  | $ 7.2400 |  |
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 |  | $ 7.3200 |  |
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 |  | $ 7.5900 |  |
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 |  | $ 0.0010 |  |
Expiration Date | [1] |  |  |
Warrants Issued in December 2020 [Member] |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Total Outstanding and Exercisable |  | 50,000 |  |
Exercise price per Share |  | $ 8.7500 |  |
Expiration Date |  | 2025-12 |  |
[1] | The pre-funded warrants do not have an expiration date.

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