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Debt - Narrative (Details) | Oct. 29, 2021 USD ($) | Jun. 27, 2019 USD ($) | Oct. 30, 2018 USD ($) covenant | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 | $ 6,927,000 |  |
2018 Term Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 21,375,000 |  |  |  |  |
PPP Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | 0 | $ 6,927,000 | $ 6,927,000 |
Line of Credit | Senior Credit Facility | 2018 Term Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility term |  |  | 3 years |  |  |  |
Maximum available for borrowing |  |  | $ 42,500,000 |  |  |  |
Line of Credit | Senior Credit Facility | Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum available for borrowing |  |  | 22,500,000 |  |  |  |
Line of Credit | Senior Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | 0 |  |  |
Maximum available for borrowing |  |  | $ 20,000,000 | $ 15,000,000 |  |  | $ 15,000,000
Repayments of line of credit borrowings |  | $ 13,000,000 |  |  |  |  |
Line of Credit | Senior Credit Facility | Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum available for borrowing | $ 15,000,000 |  |  |  |  |  |
Covenant compliance, minimum trailing twelve month Consolidated Adjusted EBITDA | $ 3,000,000 |  |  |  |  |  |
Line of Credit | Senior Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of financial covenants | covenant |  |  | 2 |  |  |  |
Covenant compliance, maximum consolidated fixed charge coverage ratio |  |  | 1.25 |  |  |  |
Line of Credit | Senior Credit Facility | Line of Credit | Debt Covenant Period, One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Covenant compliance, maximum consolidated leverage ratio |  |  | 2.50 |  |  |  |
Line of Credit | Senior Credit Facility | Line of Credit | Debt Covenant Period, Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Covenant compliance, maximum consolidated leverage ratio |  |  | 2.00 |  |  |  |

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