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ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 01, 2021 | Dec. 31, 2020
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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

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