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Stockholders' Equity - Shares Reserved for Future Issuance (Details) - shares | Dec. 31, 2021 | Dec. 31, 2020
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Stockholders' Equity |  |
Number of shares reserved for future issuance | 9,784,254 | 1,607,657
Series X Preferred Stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 5,242,501 |
Warrants for the purchase of common Stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 1,530,380 | 1,032,291
Options outstanding to purchase common Stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 1,346,733 | 227,846
Options available for future issuance to purchase common stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 1,633,736 | 322,695
Shares reserved for the employee stock purchase plan |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 30,904 | 24,825

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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