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v3.21.2

Critical Accounting Policies and Estimates (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Allowance for doubtful accounts | $ 107,000 |  | $ 41,000
Accounts receivable for chargebacks | 611,000 |  | 179,000
Allowance for slow moving and obsolete inventory | 268,000 |  | 546,000
Amount of revenue from contract liabilities related to open jobs outstanding | 4,867,000 |  |
Impairment of long-lived assets | 0 | $ 0 |
Estimated liability for compensation claims | 1,143,000 |  | 933,000
Liability for post retirement healthcare benefits | 9,031,000 |  | 9,109,000
Contract with Customer, Asset, after Allowance for Credit Loss, Current | 104,000 |  | $ 554,000
Contract-based intangible assets |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Impairment on contract assets | $ 0 |  |

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