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SUMMARY OF SIGNIFICANT ACCOUNTING PRINCIPLES AND PRACTICES - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 19, 2023 USD ($) | Sep. 30, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  | 2 |  |  |  |
Research and development, design and related engineering |  | $ 53,500,000 | $ 48,300,000 | $ 43,300,000 |  |
Cash and cash equivalents maturity period (in months) |  | 3 months |  |  |  |
Depreciation expense |  | $ 12,200,000 | 12,000,000 | 12,700,000 |  |
Unamortized balance of deferred financing costs |  |  | 3,200,000 |  |  |
Debt issuance amortization expense |  | 3,000,000 | 800,000 | 400,000 |  |
Debt issuance costs |  |  |  |  | $ 8,800,000 |
Net gain on sale |  | 0 | 0 | 5,014,000 |  |
Impairment charge |  | 0 | 0 | 0 |  |
Income associated with reversal of liability related to equity investment |  | 1,800,000 |  |  |  |
Valuation allowance | $ 43,500,000 | 65,640,000 | 57,369,000 | 43,500,000 |  |
Cash dividends paid |  | 0 | 0 | 0 |  |
Term Loan Agreement | Line of Credit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Unamortized balance of deferred financing costs |  | 4,300,000 |  |  |  |
Debt face amount |  |  |  |  | 90,000,000 |
Term Loan Agreement | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Unamortized balance of deferred financing costs |  | $ 2,000,000 |  |  |  |
ABL Revolving Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 115,000,000 |
Disposed of by Sale | Aerospace facilities |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Net gain on sale | $ 5,000,000 |  |  |  |  |
Building | Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 25 years |  |  |  |
Building | Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 40 years |  |  |  |
Machinery and Equipment | Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 4 years |  |  |  |
Machinery and Equipment | Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Property, plant and equipment, useful life (in years) |  | 10 years |  |  |  |
United States Department Of Transportation | Grant |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
USDOT grant receivable amount (up to) |  |  |  |  |  | $ 14,700,000
Portion of grant received |  |  | 7,300,000 | 7,400,000 |  |
Revenue recognized included in contract liability balance |  |  | $ 6,000,000 | $ 8,700,000 |  |

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