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Stockholders' Equity - June 2021 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Amount paid for clearing fees | $ 19 |
Institutional investors |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Sale of common stock (in shares) | 990,100 |
Sale of common stock (USD per share) | $ 5.05 |
Amount paid for placement agent commissions | $ 400 |
Amount paid related to expenses for registered direct offering and concurrent private placement | 51 |
Offering costs paid on the issuance of common stock and warrants |  | $ 470
Proceeds from sale of common stock and warrants | $ 4,500 |

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