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Stockholders' Equity (Warrants Activity) (Details) - $ / shares | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 04, 2022
Runway Debt Facility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price (in dollars per share) |  |  | $ 0.8021
Warrants issued |  |  | 748,036
Warrants [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants outstanding, beginning | 3,308,654 |  |
Warrants, expired | (3,000,270) |  |
Warrants granted | 748,036 |  |
Warrants outstanding, ending | 1,056,420 | 3,308,654 |
Warrant exercise price (in dollars per share) | $ 1.54 | $ 8.02 |
Warrants exercise price, expired (in dollars per share) | 8.50 |  |
Warrant exercise price, grants during the period (in dollars per share) | $ 0.80 |  |
Warrants outstanding, remaining contractual life | 9 years 3 days | 8 months 23 days |
Warrants granted, remaining contractual life | 9 years 11 months 4 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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