Long-Term Debt - Components (Details) - USD ($) $ in Thousands  | 
Sep. 30, 2021  | 
May 31, 2021  | 
Dec. 31, 2020  | 
|---|---|---|---|
| Debt Instrument [Line Items] | |||
| Deferred financing costs | $ (569) | $ (61) | |
| Total | 28,053 | 8,003 | |
| Debt – current portion | 13,731 | 3,687 | |
| Long-term debt – less current portion | 14,322 | 4,316 | |
| Term loan | |||
| Debt Instrument [Line Items] | |||
| Outstanding debt | 20,000 | 5,150 | |
| Revolving credit line | |||
| Debt Instrument [Line Items] | |||
| Outstanding debt | 3,000 | 0 | |
| Property and equipment loan | |||
| Debt Instrument [Line Items] | |||
| Outstanding debt | 0 | $ 600 | 833 | 
| Equipment loan | |||
| Debt Instrument [Line Items] | |||
| Outstanding debt | $ 5,622 | $ 2,081 | 
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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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. No definition available. 
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Long-Term Debt, Current Maturities, Excluding Convertible Notes No definition available. 
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- Definition Long-Term Debt, Excluding Convertible Notes No definition available. 
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- Definition Long-Term Debt, Excluding Convertible Notes And Current Maturities No definition available. 
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