LEASES - Operating and Financing Lease Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease right-of-use assets	$ 5,664	$ 5,457
Property and equipment, net	1,625	1,907
Total Leased Assets	7,289	7,364
Operating lease liabilities, current	2,251	2,087
Operating lease liabilities, non-current	3,933	3,858
Deferred revenue, current, and other	200	295
Other liabilities	244	261
Total Lease Liabilities	$ 6,628	$ 6,501