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STOCKHOLDERS' EQUITY - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) $ / shares shares | May 31, 2020 shares | Jan. 31, 2020 shares | May 31, 2019 shares | Apr. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Mar. 10, 2020 USD ($) shares | Mar. 09, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate value of common stock and other securities | $ |  |  |  |  | $ 175,000 | $ 111,760 |  |  |
Value of unsold securities on current effective registration statements | $ |  |  |  |  | $ 60,000 |  |  |  |
Value of additional shares authorized | $ |  |  |  |  |  |  |  | $ 5,000 |
Shares repurchase authorized (in shares) |  |  |  |  |  |  |  |  | 364,446
Number of active equity plans | plan |  |  |  |  |  | 1 |  |  |
Shares available for future grant (in shares) | 1,244,000 |  |  |  |  | 1,244,000 |  | 364,446 |
Options granted (in shares) |  |  |  |  |  | 771,000 |  |  |
Share-based compensation | $ |  |  |  |  |  | $ 2,365 | $ 2,268 |  |
Exercised in period, intrinsic value | $ |  |  |  |  |  | 205 | $ 356 |  |
Unrecognized compensation costs | $ | $ 2,563 |  |  |  |  | $ 2,563 |  |  |
Period of recognition of unrecognized compensation costs (in years) |  |  |  |  |  | 1 year 9 months |  |  |
Commitment Offering |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued | 2,990,000 |  |  |  |  |  |  |  |
Public offering price (USD per Share) | $ / shares | $ 7.25 |  |  |  |  | $ 7.25 |  |  |
Sale of stock, consideration received on transaction | $ | $ 21,700 |  |  |  |  |  |  |  |
The 2018 Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for future grant (in shares) | 750,000 |  |  |  |  | 750,000 |  |  |
Options granted (in shares) |  |  |  |  |  | 1,713,000 |  |  |
The 2018 Plan | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 3 years |  |  |
Award expiration period (in years) |  |  |  |  |  | 5 years |  |  |
The 2018 Plan | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period (in years) |  |  |  |  |  | 4 years |  |  |
Award expiration period (in years) |  |  |  |  |  | 10 years |  |  |
2018 Plan Amendment |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares authorized (in shares) |  | 1,000,000 |  | 600,000 |  |  |  |  |
Offer Exchange Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Outstanding (in USD per Share) | $ / shares |  |  |  |  |  |  | $ 8.50 |  |
Number of shares underlying an eligible option in exchange for one new RSU (in shares) |  |  |  |  |  |  | 2.5 |  |
Options purchased (in shares) |  |  | 467,500 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted in exchange (in shares) |  |  |  |  |  | 597,000 |  |  |
Unrecognized compensation costs | $ | $ 2,238 |  |  |  |  | $ 2,238 |  |  |
Period of recognition of unrecognized compensation costs (in years) |  |  |  |  |  | 2 years 3 months 25 days |  |  |
Vested in period, fair value | $ |  |  |  |  |  | $ 528 | $ 430 |  |
Restricted Stock Units (RSUs) | Offer Exchange Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted in exchange (in shares) |  |  | 187,000 |  |  |  |  |  |

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