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INCOME TAXES - Effective income tax rate reconciliation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
US Federal statutory rate 21.00% 21.00% 35.00%
State taxes, net of Federal benefit 3.20% 2.40% 2.00%
Foreign taxes 0.40% 26.50% 0.00%
Impact of Tax Cuts and Jobs Act 0.00% 0.00% 81.90%
Domestic production activities deduction (0.00%) (0.00%) (8.80%)
Change in valuation allowance (58.10%) (26.50%) 0.00%
Stock-based compensation (6.70%) (1.80%) 0.80%
Non-deductible costs 9.10% 0.00% 0.50%
Change in state apportionment factors, state and foreign rates (28.10%) 0.00% 0.00%
Research and experimentation and charitable credits (33.50%) (0.00%) (2.50%)
Transfer pricing and other (0.20%) 1.10% (2.30%)
Total income tax (benefit)/provision (93.00%) 22.70% 106.60%
Scenario, Plan [Member]      
US Federal statutory rate 21.00%