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ACQUISITIONS - Schedule of Intangible Assets Acquired, Amortization Method, and Estimated Useful Lives (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 01, 2021	Jan. 31, 2021	Dec. 31, 2020
TEGAM, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:	$ 6,900
Versatile Power, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			$ 4,000
Technology
Business Acquisition [Line Items]
Useful Life		5 years
Technology \| TEGAM, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:	$ 1,100
Useful Life	5 years
Technology \| Versatile Power, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			$ 400
Useful Life			5 years
Customer Relationships [Member] \| TEGAM, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:	$ 5,500
Useful Life	15 years
Customer Relationships [Member] \| Versatile Power, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:			$ 3,600
Useful Life			15 years
Trade Names [Member] \| TEGAM, Inc. [Member]
Business Acquisition [Line Items]
Amortizable intangible assets:	$ 300
Useful Life	5 years