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Common Stock Warrants (Details) - $ / shares | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Warrants |  |  |
Warrant outstanding (in shares) |  | 11,177 | 19,426
Five Year Warrants Issued in February 2016 [Member] |  |  |
Warrants |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 15.40
Warrant outstanding (in shares) |  |  | 8,249
Exercise of warrant | 4,917 |  |
Ten Year Warrants Issued in May 2018 [Member] |  |  |
Warrants |  |  |
Exercise price of warrants (in dollars per share) |  | $ 23.69 | $ 23.69
Warrant outstanding (in shares) |  | 6,332 | 6,332
Common stock warrant, Exercise price $14.71 per share, Issued March 2019 |  |  |
Warrants |  |  |
Exercise price of warrants (in dollars per share) |  | $ 14.71 | $ 14.71
Warrant outstanding (in shares) |  | 4,845 | 4,845

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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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