SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred commission cost (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Deferred costs - current	$ 72	$ 103
Deferred costs - noncurrent	23	34
Accounting Standards Update 2014-09 [Member]
Deferred costs - current	72	103
Deferred costs - noncurrent	23	34
Total deferred costs	$ 95	$ 137