SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregate revenue (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Partner and Marketplace			$ 7,724	$ 6,552
Enterprise			6,751	5,257
Total revenues	$ 7,569	$ 6,021	$ 14,475	$ 11,809

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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