SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Inventory (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Raw material		$ 26,814	$ 25,695
Work in Process		284	306
Finished goods		37,694	32,783
Total inventories	[1]	$ 64,792	$ 58,784

[1] Amounts include $542 and $2,505 of inventory purchased from the former owners of the original Invictus business as of September 30, 2021 and December 31, 2020, respectively. Please also read Note 15—Related Parties to our condensed consolidated financial statements.