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Summary of Warrant Activity (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Warrants And Rights Note Disclosure [Abstract] |  |
Number of Shares Underlying Warrants, Outstanding | 7,857 | 10,194
Number of Shares Underlying Warrants, Forfeited | (7,772) | (2,337)
Number of Shares Underlying Warrants, Outstanding | 85 | 7,857
Warrants Outstanding, Weighted Average Exercise Price | $ 53.61 | $ 155.73
Warrants Forfeited, Weighted Average Exercise Price | 49.91 | 499.50
Warrants Outstanding, Weighted Average Exercise Price | $ 392.70 | $ 53.61

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- Definition Class of warrant or right weighted average exercise price per warrants or right forfeited. + References No definition available. + Details
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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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