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Stockholders' Equity - June 2020 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jan. 31, 2020 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Amount paid for clearing fees | $ 18 |  |  |  |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  | $ 334 | $ 469 | $ 334 | $ 469 |
Warrants issued (in shares) |  |  |  |  | 229,414 | 310,860 |
Proceeds from the exercise of warrants |  |  | $ 0 | $ 0 | $ 0 | $ 527 |
January 2020 Institutional Investor |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Sale of common stock (in shares) |  | 688,360 |  |  |  |  |
Sale of common stock (USD per share) |  | $ 3.3700 |  |  |  |  |
Securities called by warrants (in shares) |  | 688,360 |  |  |  |  |
Purchase price (USD per share) |  | $ 0.625 |  |  |  |  |
Investor Warrants |  |  |  |  |  |  |
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 |  |  | $ 5.05 |  | $ 5.05 |
Exercise price of common stock (USD per share) |  | $ 3.37 |  |  |  |  |
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 |  |  |  |  |  |  | $ 469
Proceeds from sale of common stock and warrants | $ 4,500 |  |  |  |  |  |
Warrants issued (in shares) |  |  | 187,734 | 269,180 |  |  |
January 2020 Equity Offering |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Exercise price of common stock (USD per share) | $ 3.59 |  | $ 3.67 | $ 3.59 | $ 3.67 | $ 3.59 |
Amount paid for placement agent commissions |  | $ 193 |  |  |  |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  | 50 |  |  |  |  |
Amount paid for clearing fees |  | 231 |  |  |  |  |
Offering costs paid on the issuance of common stock and warrants |  |  |  |  |  |  | $ 510
Proceeds from sale of common stock and warrants |  | $ 2,300 |  |  |  |  |
Warrants issued (in shares) |  |  | 229,414 | 310,860 |  |  |
Estimated proceeds from issuance of warrants |  |  |  |  | $ 800 |  |
Issuance of common stock upon the exercise of warrants (in shares) |  |  |  |  | 0 | 156,446 |
January 2020 Equity Offering, Private Placement |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Securities called by warrants (in shares) |  | 48,185 |  |  |  |  |
Exercise price of common stock (USD per share) |  | $ 4.9940 |  |  |  |  |
Warrants issued (in shares) |  |  | 41,680 | 41,680 |  |  |

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