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INCOME TAXES - Differences Between Income Taxes Computed at Statutory Income Tax Rate and Provision For Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income taxes computed at federal statutory rate | $ (9,978) | $ 9,801 | $ 10,228
State income taxes, net of federal benefit | (2,591) | 1,294 | 1,880
Foreign taxes | (492) | 311 | 150
Nondeductible expenses | 5,617 | 1,108 | 954
Enacted rate changes | 670 | 0 | 0
Research and development tax credit | (16,878) | (2,324) | (480)
Foreign tax credit | 0 | (57) | (346)
Valuation allowance | 16 | (5) | 0
Tax reform deferred tax remeasurement | 0 | 0 | 81
Deferred tax liability true up | (551) | 1,065 | 0
Uncertain tax positions | 5,057 | 665 | 172
Other | 689 | (964) | 546
Total income tax expense (benefit) | $ (18,441) | $ 10,894 | $ 13,185

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