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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 38.90% (1.70%) 97.40%
Foreign rate differences (43.90%) 2.10% (76.10%)
Impairment of goodwill 65.50% (20.80%) 98.60%
Non-deductible expenses 16.40% (1.20%) 129.90%
Tax Act- revaluation of net deferred tax assets and other 0 0 0.168
Tax Act- transition tax 0 0 0.430
Uncertain tax positions 4.00% (0.30%) 302.80%
Research and development credit (7.20%) 1.40% (18.50%)
Federal return to provision 6.80% 0.40% (27.50%)
Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act, Pre-Acquisition Loss 8.60% 0.00% 0.00%
Equity-based compensation 19.40% 0.00% 0.00%
Valuation Allowance 48.30% (3.10%) (34.20%)
Other 0.00% (0.30%) 14.40%
Provision for income taxes 177.80% (2.50%) 567.60%