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Equity - Consultant Stock Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock for services 1.93 per share | $ 1.93 |
Common stock for services 2.33 per share | $ 2.33 | $ 2.33
Common stock for services 1.03 per share |  | $ 1.03
Consultant Stock Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Reserved but unissued shares under the Consultant Plan at January 1 | 212,000 | 190,000
Increases in the number of authorized shares under the Consultant Plan | 14,000 | 33,000
Stock grants | (15,000) | (11,000)
Reserved but unissued shares under the Consultant Plan at Period End | 211,000 | 212,000
Maximum increase in available number of authorized shares as a percentage of new shares issued | 1.00% |
Consultant Stock Plan | General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated Share-based Compensation Expense | $ 33 | $ 17
Consultant Stock Plan | October 1, 2021 to September 30, 2022 | Consultant, Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued for services (in shares) | 15,000 |
Common stock for services 1.93 per share | $ 1.93 |
Allocated Share-based Compensation Expense | $ 7 |
Value of stock options granted | $ 29 |
Shares expensed in period | 3,700 |
Consultant Stock Plan | September 1, 2020 through September 30, 2021 | Consultant, Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued for services (in shares) | 15,000 |
Common stock for services 2.33 per share | $ 2.33 |
Allocated Share-based Compensation Expense | $ 26 | $ 9
Value of stock options granted | $ 35 |
Shares expensed in period | 11,300 | 3,700
Consultant Stock Plan | September 1, 2019 through August 31, 2020 | Consultant, Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued for services (in shares) |  | 10,000
Allocated Share-based Compensation Expense |  | $ 8
Consultant Stock Plan | September 1, 2019 through August 31, 2020 | Consultant, Three |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock for services 2.33 per share |  | $ 1.03
Value of stock options granted |  | $ 10
Shares expensed in period |  | 7,500

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