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STOCKHOLDERS' EQUITY - Narrative (Details) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2020 shares | May 31, 2019 shares | Jun. 30, 2018 USD ($) $ / shares shares | Apr. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) plan $ / shares shares | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate value of common stock and other securities | $ |  |  |  | $ 175,000,000 | $ 133,438,000 |
Value of unsold securities on current effective registration statements | $ |  |  |  | $ 60,000,000 |  |
Stock issued (in Shares) |  |  | 2,375,000 |  |  |
Public offering price (USD per Share) | $ / shares |  |  | $ 17.50 |  |  |
Proceeds from issuance of common stock | $ |  |  | $ 38,900,000 |  |  |
Shares repurchase authorized |  |  |  |  | 450,000 |
Shares repurchased |  |  |  |  | 384,000 |
Payments for repurchase of common stock | $ |  |  |  |  | $ 5,000,000 |
Active equity plans | plan |  |  |  |  | 1 |
Shares available for future grant (in Shares) |  |  |  |  | 387,000 |
Options granted (in Shares) |  |  |  |  | 721,000 |
Compensation expense | $ |  |  |  |  | $ 1,990,000 | $ 1,565,000
Exercised in period, intrinsic value | $ |  |  |  |  | 356,000 | 276,000
Unrecognized compensation costs | $ |  |  |  |  | $ 2,180,000 |
Period of recognition of unrecognized compensation costs |  |  |  |  | 2 years 2 months |
The 2018 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant (in Shares) |  |  |  |  | 750,000 |
Options granted (in Shares) |  |  |  |  | 1,756,000 |
The 2018 Plan | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |
Award expiration period |  |  |  |  | 5 years |
The 2018 Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |
Award expiration period |  |  |  |  | 10 years |
2018 Plan Amendment |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of increase in options (in Shares) |  | 600,000 |  |  |  |
Offer Exchange Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding (USD per Share) | $ / shares |  |  |  |  | $ 8.50 |
Number of shares underlying an eligible option in exchange for one new RSU (in Shares) |  |  |  |  | 2.5 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted in exchange (in Shares) |  |  |  |  | 29,000 |
Unrecognized compensation costs | $ |  |  |  |  | $ 540,000 |
Period of recognition of unrecognized compensation costs |  |  |  |  | 1 year 9 months |
Vested in period, fair value | $ |  |  |  |  | $ 430,000 | $ 22,000
Subsequent Event | Offer Exchange Program |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options purchased (in Shares) | 467,500 |  |  |  |  |
Subsequent Event | 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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