PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
PREPAID EXPENSES AND OTHER CURRENT ASSETS
Receivable for warrants exercised	$ 12,357
Prepaid insurance	2,948	$ 121
Prepaid operating expenses	1,015	68
Prepaid dues and subscriptions	883	189
Prepaid taxes	474
Vendor prepayments	473
Prepaid rent	155	118
Deferred cost of goods sold		454
Other	352	26
Total prepaid expenses and other current assets	$ 18,657	$ 976