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ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - Versatile Power, Inc. [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Total fair value of net assets acquired		$ 6,799
Preliminary Fair Value [Member]
Business Acquisition [Line Items]
Current assets and liabilities, net	$ 1,013
Property and equipment	35
Operating lease right-of-use assets	463
Intangible assets	4,000
Goodwill	1,751
Total assets acquired	7,262
Operating lease liability	463
Total liabilities assumed	463
Total fair value of net assets acquired	$ 6,799

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