SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition - Deferred Customer Acquisition Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
SIGNIFICANT ACCOUNTING POLICIES
Capitalized Contract Cost, Amortization Period	1 year 9 months 18 days
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0
Opening balance	11,366	8,976
Additions to deferred customer acquisition costs	9,002	7,930
Amortization of deferred customer acquisition costs	(9,365)	(6,442)
Ending balance	$ 11,003	$ 10,464