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ACQUISITIONS - Consideration Transferred (Details) - USD ($) $ in Thousands |  | 12 Months Ended
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Jun. 01, 2021 | Dec. 31, 2020
TEGAM, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Cash paid for acquisition | $ 15,552 |
Holdback | 2,100 |
Total fair value of consideration transferred | 17,652 |
Less cash acquired | (472) |
Total purchase price | $ 17,180 |
Acquired percentage | 100.00% |
Versatile Power, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Cash paid for acquisition |  | $ 4,601
Holdback |  | 950
Contingent consideration |  | 1,500
Total fair value of consideration transferred |  | 7,051
Less cash acquired |  | (245)
Total purchase price |  | $ 6,806
Acquired percentage |  | 100.00%

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