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Stockholders' Equity - Common Stock Warrants (Details) - Common Stock - $ / shares | Sep. 30, 2021 | May 03, 2021 | Apr. 28, 2021 | Mar. 27, 2021 | Dec. 31, 2020
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Class of Warrant or Right [Line Items] |  |  |  |  |
Number of shares called by warrants (in shares) | 0 |  |  |  | 413,320
Exercise price (in dollars per share) |  |  |  |  | $ 3.00
Warrant expirations (in shares) |  | 117,262 | 132,884 | 163,174 |

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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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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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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