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Equity - Common Stock and Preferred Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 | Aug. 24, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2018 | Dec. 31, 2021 | Dec. 31, 2020
Stockholders' equity |  |  |  |  |  |  |
Common stock, authorized shares |  |  |  |  |  | 62,500 |
Preferred stock, authorized shares |  |  |  |  |  | 2,000 |
Number of shares of common stock issued |  |  |  |  |  |  | 3,242
Shares Issued, Price Per Share |  |  |  |  |  |  | $ 2.00
Net proceeds from the offering | $ 1,300 | $ 4,800 |  |  |  |  |
Net proceeds from the offering |  |  |  |  |  | $ 5,309 | $ 6,053
Public offering |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |
Number of shares of common stock issued |  |  |  | 2,600 |  |  |
Shares Issued, Price Per Share |  |  |  | $ 2.00 |  |  |
Net proceeds from the offering |  |  |  | $ 4,800 |  |  |
Private offering |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |
Number of shares of common stock issued |  |  | 654 |  |  |  |
Shares Issued, Price Per Share | $ 2.00 |  | $ 2.00 |  |  |  |
Net proceeds from the offering |  |  | $ 1,300 |  |  |  |
ATM |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |
Number of shares of common stock issued |  |  |  |  |  | 1,100 |
Shares Issued, Price Per Share |  |  |  |  |  | $ 5.03 |
Aggregate offering price |  |  |  |  |  | $ 15,000 |
Gross proceeds from the offering |  |  |  |  |  | 5,500 |
Net proceeds from the offering |  |  |  |  |  | $ 5,300 |
Participation Right |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  |
Stock Issued, Investor, Maximum Voting Power Percentage |  |  |  |  | 20.00% |  |
Stock Issued, Investor, Maximum Beneficial Ownership Percentage |  |  |  |  | 20.00% |  |

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