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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) customer plant | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 bank | Dec. 31, 2023 employee | Dec. 31, 2023 salariedEmployee | Dec. 31, 2023 hourlyEmployee
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of banks | bank |  |  |  | 3 |  |  |
Cash and cash equivalents | $ 24,104,000 | $ 4,183,000 |  |  |  |  |
Allowance for doubtful accounts | 0 | 0 |  |  |  |  |
Accounts receivable for chargebacks | 138,000 | 502,000 |  |  |  |  |
Allowance for slow moving and obsolete inventory | 671,000 | 433,000 |  |  |  |  |
Contract assets | 77,000 | 344,000 |  |  |  |  |
Contract liabilities | 5,204,000 | 1,395,000 |  |  |  |  |
Amount of revenue from contract liabilities related to open jobs outstanding | 2,446,000 | 14,562,000 |  |  |  |  |
Impairment of long-lived assets | 0 | 0 | $ 0 |  |  |  |
Loss on disposal of assets | 80,000 | 0 | 571,000 |  |  |  |
Goodwill impairment | 0 | 0 |  |  |  |  |
Liability for self insurance reserve | 988,000 | 889,000 |  |  |  |  |
Liability for post retirement healthcare benefits | $ 3,116,000 | 6,625,000 |  |  |  |  |
Number of major customers | customer | 5 |  |  |  |  |  |
Number of employees |  |  |  |  | 1,857 | 369 | 1,488
Number major plants | plant | 4 |  |  |  |  |  |
Research and development costs | $ 1,700,000 | 1,600,000 | 1,300,000 |  |  |  |
Net foreign current translation and transaction expense | $ 291,000 | $ 401,000 | $ 149,000 |  |  |  |
United States |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 698 |  |
Mexico |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 985 |  |
Canada |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  | 174 |  |
Workforce Subject to Collective Bargaining Arrangements | Geographic Concentration Risk | United States, Canada and Mexico |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 67.30% |  |  |  |  |  |
Five Largest Customers | Revenue Benchmark | Customer Concentration Risk |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 68.00% | 64.00% | 63.00% |  |  |  |
Five Largest Customers | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
concentration risk percentage | 67.00% |  |  |  |  |  |
Contract-Based Intangible Assets |  |  |  |  |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |  |  |  |  |
Impairment on contract assets | $ 0 | $ 0 |  |  |  |  |

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