SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition - Primary Geographical Market (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of Operating Segments | segment				1
Number of Reportable Segments | segment				1
Total revenues		$ 148,190	$ 110,927	$ 285,148	$ 211,533
Greater China
Disaggregation of Revenue [Line Items]
Total revenues	[1]	46,785	37,640	89,826	77,027
United States
Disaggregation of Revenue [Line Items]
Total revenues		18,528	13,409	38,310	21,368
All other countries
Disaggregation of Revenue [Line Items]
Total revenues	[2]	$ 82,877	$ 59,878	$ 157,012	$ 113,138

[1] Greater China is inclusive of Mainland China, Hong Kong and Taiwan

[2] No single country included in the other countries’ category generated more than 10% of total revenue