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ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 01, 2021
Dec. 31, 2020
TEGAM, Inc. [Member]      
Business Acquisition [Line Items]      
Current assets and liabilities, net   $ 3,536  
Property and equipment   734  
Operating lease right-of-use assets   425  
Intangible assets   6,900  
Goodwill (deductible for tax purposes)   5,877  
Other non-current assets   31  
Total assets acquired   17,503  
Other non-current liabilities   25  
Operating lease liability   425  
Total liabilities assumed   450  
Total fair value of net assets acquired   $ 17,053  
Versatile Power, Inc. [Member]      
Business Acquisition [Line Items]      
Current assets and liabilities, net     $ 1,021
Property and equipment     35
Operating lease right-of-use assets     463
Intangible assets     4,000
Goodwill (deductible for tax purposes)     323
Total assets acquired     5,842
Other non-current liabilities     20
Operating lease liability     463
Total liabilities assumed     483
Total fair value of net assets acquired $ 5,359   $ 5,359