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INCOME TAXES - Reconciliation of Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of income taxes at U.S. Federal statutory rate to the provision for income taxes      
U.S. federal statutory rate 21.00% 21.00% 21.00%
State taxes 3.82% 3.15% (7.33%)
Foreign taxes (1.15%) 3.18% (3.95%)
Change in valuation allowance 6.55% (647.87%) 19.76%
Stock-based compensation (3.80%) (1.08%) (10.53%)
Tax credits (3.00%) (7.92%) 19.93%
Effect of rate changes 0.00% 0.00% (0.42%)
Convertible senior notes refinancing 0.00% (5.22%) 0.00%
Nondeductible expenses 5.13% 4.55% (13.58%)
Reserves (1.31%) 7.66% (15.41%)
338(g) tax election 0.00% 0.00% (9.61%)
Other (1.67%) (1.84%) (2.35%)
Effective tax rate 25.57% (624.39%) (2.49%)