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INCOME TAXES - Difference between Provision for Income Taxes and Amount Computed by Applying Federal Statutory Rates (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Federal income taxes at the statutory rate 21.00% 21.00% 21.00%
State and local income taxes, net of Federal income tax benefit 8.80% 38.90% (1.70%)
Foreign rate differences (8.00%) (43.90%) 2.10%
Impairment of goodwill (1) 0.00% 65.50% (20.80%)
Non-deductible expenses 3.30% 16.40% (1.20%)
Uncertain tax positions 0.10% 4.00% (0.30%)
Research and development credit (1.10%) (7.20%) 1.40%
Federal return to provision (0.40%) 6.80% 0.40%
Loss of Filament pre-acquisition attributes due to CARES Act 0.00% 8.60% 0.00%
Equity-based compensation (0.60%) 19.40% 0.00%
Valuation Allowance 22.40% 48.30% (3.10%)
Other 0.00% 0.00% (0.30%)
Provision for income taxes 45.50% 177.80% (2.50%)