PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses and other advances	$ 2,513	$ 4,272
Software licenses	3,220	1,492
Insurance	1,095	852
Inventory purchase advances	177	2,206
Cloud computing subscription & implementation costs	4,806	1,986
Tenant facility lease allowances	789	789
Deferred IPO costs	0	446
Other current assets	294	3,177
Total prepaid expenses and other current assets	$ 12,894	$ 15,220