INTANGIBLE ASSETS, NET, AND GOODWILL - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 2,690	$ 2,075
Less: Accumulated amortization	(571)	(499)
Total amortization expense	2,119	1,576
Impact of foreign currency translation	17	0
Patents
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	2,399	1,801
Other
Finite-Lived Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 291	$ 274