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v3.21.2

Stockholders' Equity - Warrants Outstanding (Details) - $ / shares | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity [Abstract] |  |  |
Warrants outstanding (in shares) | 422,549 | 422,549 | 15,277
Exercise price of warrants (in dollars per share) | $ 0.11 | $ 0.11 | $ 2.75
Weighted average remaining life | 1 year 4 months 13 days | 2 years 1 month 13 days |

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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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