PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses and other advances	$ 2,505	$ 4,272
Software licenses	3,181	1,492
Insurance	1,786	852
Inventory purchase advances	91	2,206
Cloud computing subscription & implementation costs	3,506	1,986
Tenant facility lease allowances	789	789
Deferred IPO costs	0	446
Other current assets	1,685	3,177
Total prepaid expenses and other current assets	$ 13,543	$ 15,220