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Stockholders' Equity - Common Stock Warrants (Details) - Warrants for the purchase of common stock | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Common Stock Warrants |
Warrants Outstanding (in shares) | shares | 1,530,380
Weighted Average |
Common Stock Warrants |
Exercise Price (in dollars per share) | $ / shares | $ 41.84
Weighted average life (in years) | 4 years 3 months 18 days
Warrants Issued in 2015 |
Common Stock Warrants |
Warrants Outstanding (in shares) | shares | 204
Exercise Price (in dollars per share) | $ / shares | $ 732.72
Warrants Issued in 2018 |
Common Stock Warrants |
Warrants Outstanding (in shares) | shares | 699,962
Exercise Price (in dollars per share) | $ / shares | $ 72.00
Warrants Issued in 2019 |
Common Stock Warrants |
Warrants Outstanding (in shares) | shares | 331,858
Exercise Price (in dollars per share) | $ / shares | $ 37.50
Warrants Issued In 2021 |
Common Stock Warrants |
Warrants Outstanding (in shares) | shares | 498,356
Exercise Price (in dollars per share) | $ / shares | $ 2.10

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- Definition Weighted average remaining contractual life of warrant, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=123467817&loc=d3e21475-112644 + Details
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