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INCOME TAXES - Effective rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INCOME TAXES      
US Federal statutory rate 21.00% 21.00% 21.00%
State taxes, net of Federal benefit 1.90% 3.20% 2.40%
Foreign taxes (0.10%) 0.40% 26.50%
Change in valuation allowance 0.70% (58.10%) (26.50%)
Stock-based compensation (2.50%) (6.70%) (1.80%)
Non-deductible costs (3.50%) 9.10%  
Change in state apportionment factors, state and foreign rates (7.30%) (28.10%)  
Research and experimentation and charitable credits 0.90% (33.50%)  
Transfer pricing and other 2.00% (0.20%) 1.10%
Effective income tax rate 13.10% (93.00%) 22.70%