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Stock-Based Compensation - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2022 USD ($) $ / shares shares | Sep. 30, 2022 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2021 $ / shares shares | Jun. 30, 2021 $ / shares shares | Mar. 31, 2021 $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) purchasePeriod shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 50,000 |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 1.70 |  |  |  |  |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.54 | $ 0.51 |
Options vested in period, fair value | $ |  |  |  |  |  |  | $ 42,000 | $ 11,000 |
2018 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Issuance of common stock shares (in shares) |  |  |  |  |  |  | 874,279 |  |
Common stock reserved for issuance (in shares) | 4,382,662 |  | 762,038 |  |  |  | 4,382,662 | 762,038 |
Granted (in shares) |  |  |  |  |  |  | 50,000 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.70 |  |
Unrecognized compensation expense | $ | $ 4,680,000 |  |  |  |  |  | $ 4,680,000 |  |
Amortization period of restricted stock cost |  |  |  |  |  |  | 2 years 2 months 12 days |  |
2018 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock reserved for issuance (in shares) | 802,893 |  | 189,215 |  |  |  | 802,893 | 189,215 |
Maximum payroll deductions (as a percent) |  |  |  |  |  |  |  |  | 15.00%
Maximum yearly contribution | $ |  |  |  |  |  |  |  |  | $ 25,000
Maximum number of shares participant may purchase |  |  |  |  |  |  |  |  | 4,000
Offering period |  |  |  |  |  |  |  |  | 24 months
Number of purchase periods | purchasePeriod |  |  |  |  |  |  |  |  | 4
Purchase period for award |  |  |  |  |  |  |  |  | 6 months
ESPP, purchase price (as a percent) |  |  |  |  |  |  |  |  | 85.00%
Unrecognized compensation expense | $ | $ 349,000 |  |  |  |  |  | $ 349,000 |  |
Amortization period of restricted stock cost |  |  |  |  |  |  | 1 year 10 months 24 days |  |
2009 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 0 |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0 |  |
Unvested shares (in shares) | 0 |  | 0 |  |  |  | 0 | 0 |
Unrecognized compensation expense | $ | $ 1,000 |  |  |  |  |  | $ 1,000 |  |
Amortization period of restricted stock cost |  |  |  |  |  |  | 8 months 12 days |  |
Employee Stock | 2018 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares | 1.50% |  |  |  |  |  | 1.50% |  |
Annual increase (in shares) | 818,825 |  |  |  |  |  | 818,825 |  |
Restricted Stock Units (RSUs) - Team Members |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unit awards granted (in shares) | 39,000 | 1,267,000 | 170,000 | 54,000 | 54,000 | 3,488,262 |  |  |
Units grant date fair value (in dollars per share) | $ / shares | $ 1.52 | $ 1.57 | $ 3.97 | $ 1.09 | $ 1.23 | $ 2.03 | $ 1.52 | $ 3.97 |
Vesting period of award | 48 months |  | 47 months | 47 months | 47 months |  |  |  |
Restricted Stock Units (RSUs) - Team Members | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period of award |  | 39 months |  |  |  | 10 months |  |  |
Restricted Stock Units (RSUs) - Team Members | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period of award |  | 49 months |  |  |  | 51 months |  |  |
Restricted Stock Units (RSUs) - Non-Employee Directors |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unit awards granted (in shares) | 397,598 | 25,000 | 368,672 |  |  |  |  |  |
Units grant date fair value (in dollars per share) | $ / shares | $ 1.48 | $ 1.70 | $ 1.35 |  |  |  | $ 1.48 | 1.35 |
Restricted Stock Units (RSUs) - Non-Employee Directors | Tranche One |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unit awards granted (in shares) |  |  |  |  |  | 652,170 |  |  |
Units grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.22 |  |  |
Restricted Stock Units (RSUs) - Non-Employee Directors | Tranche Two |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unit awards granted (in shares) |  |  |  |  |  | 97,744 |  |  |
Units grant date fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.22 |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unit awards granted (in shares) |  |  |  |  |  |  | 1,728,598 |  |
Units grant date fair value (in dollars per share) | $ / shares | $ 1.75 |  | $ 1.94 |  |  |  | $ 1.75 | $ 1.94 |
Vested in period (in shares) |  |  |  |  |  |  | 1,803,212 |  |
Restricted Stock Units | Tranche One |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  |  | 39,438 |  |
Restricted Stock Units | Tranche Two |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vested in period (in shares) |  |  |  |  |  |  | 39,445 |  |
Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options | $ | $ 50,000 |  | $ 1,168,000 |  |  |  | $ 50,000 | $ 1,168,000 |
Total fair value for options | $ |  |  |  |  |  |  | $ 17,000 | $ 66,000 |
Outstanding Shares on Last Day of Immediately Preceding Year | Employee Stock | 2018 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares |  |  |  |  |  |  |  |  | 5.00%

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