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STOCK-BASED COMPENSATION - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 14, 2019 shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of available shares consumed for each restricted stock and restricted stock units issued |  | 1.75 |
Expected dividend yield |  | 0.00% |
Unrecognized compensation cost | $ |  | $ 8,000,000 |
Unrecognized compensation cost, recognized over an estimated weighted-average period |  | 2 years 7 months 2 days |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based payment award vesting period |  | 4 years |
Increase in number of common shares reserved for issuance (in shares) | 2,595,751 |  |
Stock options outstanding (in shares) |  | 967,000 |
Stock options | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based payment award expiration period |  | 7 years |
Stock options | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based payment award expiration period |  | 10 years |
Time-based stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value (in dollars per share) | $ / shares |  | $ 3.69 |
Stock options outstanding (in shares) |  | 967,000 | 1,862,000
RSAs outstanding |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based payment award vesting period |  | 1 year |
RSUs outstanding |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based payment award vesting period |  | 3 years |
Market condition based stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options outstanding (in shares) |  | 0 | 272,081
Employee stock purchase plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of fair market value on the purchase date |  | 85.00% |
Maximum number of shares per employee (in shares) |  | 2,000 |
Offering period |  | 6 months |
Maximum value of shares per employee | $ |  | $ 25,000 |
Common stock reserved for issuance (in shares) |  | 1,000,000.0 |
Purchases under ESPP (in shares) |  | 21,741 |
Average purchase price (in dollars per share) | $ / shares |  | $ 7.60 |
Shares available for purchase (in shares) |  | 253,437 |

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