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INCOME TAXES - Narratives (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Contingency |  |  |
Share-based compensation, permanent reconciling amount |  | $ 15,300,000 |
Deferred tax asset, valuation allowance | $ 2,450,000 | 0 |
NOL carryforward, federal | 0 | 100,000 |
NOL carryforward, state | 3,100,000 | 3,700,000 |
Accrual for uncertain tax positions | 200,000 | 700,000 |
Unrecognized tax benefits | 1,656,000 | 1,329,000 | $ 1,253,000
Internal Revenue Service (IRS) |  |  |
Income Tax Contingency |  |  |
Share-based compensation, permanent reconciling amount | 15,500,000 | 2,400,000 | $ (8,500,000)
Federal |  |  |
Income Tax Contingency |  |  |
Tax credit, research | 1,000,000 | 200,000 |
State |  |  |
Income Tax Contingency |  |  |
Tax credit, research | $ 1,000,000 | $ 600,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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