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Common Stock - Summary of Outstanding Warrants (Detail) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019
Series A-1 Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Total Outstanding and Exercisable | 108 |
Exercise price per Share | $ 5,280.0000 |
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 | $ 699.2000 |
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 | 1,060,718 |
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 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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