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Common Stock - Summary of Outstanding Warrants (Detail) | 3 Months Ended
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Mar. 31, 2020 $ / shares shares
Series A-1 Warrants [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 2,175
Exercise price per Share | $ / shares | $ 264.0000
Expiration Date | 2020-10
Warrants Issued In September 2017 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 8,224
Exercise price per Share | $ / shares | $ 34.9600
Expiration Date | 2023-03
Warrants Issued In June 2018 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 2,282,000
Exercise price per Share | $ / shares | $ 4.0000
Expiration Date | 2023-06
Warrants Issued in October 2018 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 624,313
Exercise price per Share | $ / shares | $ 3.1445
Expiration Date | 2023-10
Warrants Issued in May 2019 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 1,200,000
Exercise price per Share | $ / shares | $ 4.5000
Expiration Date | 2025-05
Warrants Issued in December 2019 [Member] |
Class of Warrant or Right [Line Items] |
Total Outstanding and Exercisable | shares | 23,000,000
Exercise price per Share | $ / shares | $ 0.6000
Expiration Date | 2024-12

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