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INCOME TAXES - Effective rate (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
US Federal statutory rate 21.00% 21.00% 21.00%
State taxes, net of Federal benefit 4.80% 3.20% 3.30%
Foreign taxes 0.00% 0.10% (1.00%)
Change in valuation allowance 0.00% 0.00% (0.30%)
Stock-based compensation 10.80% (1.40%) (1.70%)
Non-deductible costs 2.10% (0.50%) (0.80%)
Change in state apportionment factors, state and foreign rates (11.80%) (0.10%) 5.50%
Research and experimentation and charitable credits (19.00%) 1.40% 0.90%
Transfer pricing and other (2.40%) (0.10%) (2.90%)
Effective income tax rate 5.50% 23.60% 24.00%