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FINANCIAL STATEMENT DETAILS - Revenue and Long-Lived Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenue $ 391,678 $ 283,218 $ 196,015
Leasehold improvements and equipment, net 2,868 3,321  
United States      
Disaggregation of Revenue [Line Items]      
Revenue 197,576 139,826 100,275
Leasehold improvements and equipment, net $ 1,901 $ 2,549  
United States | Revenue Benchmark | Geographic Concentration Risk      
Disaggregation of Revenue [Line Items]      
Concentration risk, percent (greater than) 10.00% 10.00%  
All other countries      
Disaggregation of Revenue [Line Items]      
Revenue $ 194,102 $ 143,392 $ 95,740
Leasehold improvements and equipment, net $ 967 $ 772