SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Deferred revenue - current	$ 7,434	$ 7,068
Deferred revenue - noncurrent	5	5
Total deferred revenue	$ 7,439	$ 7,073