BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Entity-wide Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	$ 123,822	$ 96,658	$ 369,011	$ 254,763
Property and equipment, net	26,652		26,652		$ 3,988
United States
Segment Reporting Information [Line Items]
Net sales	104,623	83,415	306,651	212,706
Property and equipment, net	20,400		20,400		3,272
Canada
Segment Reporting Information [Line Items]
Net sales	21,268	13,967	67,364	44,352
Property and equipment, net	6,252		6,252		$ 716
Intersegment eliminations
Segment Reporting Information [Line Items]
Net sales	$ (2,069)	$ (724)	$ (5,004)	$ (2,295)