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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
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income taxes computed at federal statutory rate $ (10,146) $ 10,029 $ 10,992
State income taxes, net of federal benefit (2,625) 1,331 2,010
Foreign taxes (493) 311 150
Nondeductible expenses 5,617 1,108 506
Enacted rate changes 670 0 0
Research and development tax credit (16,879) (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 638 (929) 1,022
Total income tax expense (benefit) $ (18,696) $ 11,194 $ 14,107