FINANCIAL STATEMENT DETAILS - Revenue and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 110,977	$ 96,046	$ 219,331	$ 185,468
Leasehold improvements and equipment, net	1,497		1,497		$ 2,868
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	56,050	48,920	109,881	$ 94,715
Leasehold improvements and equipment, net	553		$ 553		1,901
United States | Revenue Benchmark | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percent (greater than)			10.00%	10.00%
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	54,927	$ 47,126	$ 109,450	$ 90,753
Leasehold improvements and equipment, net	$ 944		$ 944		$ 967