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STOCK-BASED COMPENSATION - NARRATIVE (Details) | 3 Months Ended
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Mar. 31, 2021 USD ($) shares | Dec. 31, 2020 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 |
Restricted stock outstanding (in shares) |  | 802,000
Shares available for purchase (in shares) | 215,338 |
Unrecognized compensation cost | $ | $ 5,300,000 |
Unrecognized compensation cost, recognized over an estimated weighted-average period | 1 year 9 months 18 days |
Stock options outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period | 4 years |
Stock-based payment award expiration period | 7 years |
RSAs outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period | 1 year |
Granted (in shares) | 0 |
Restricted stock outstanding (in shares) | 130,000 | 130,000
RSUs outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based payment award vesting period | 3 years |
Granted (in shares) | 0 |
Restricted stock outstanding (in shares) | 565,000 |
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 |
Employee stock purchase plan 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) | 15,543 |
Market Performance Based Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted (in shares) |  | 250,000
Restricted stock outstanding (in shares) | 250,000 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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