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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
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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 |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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