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Debt (Details) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) instrument item | Dec. 31, 2020 USD ($)
--- | --- | --- | ---
DEBT |  |  |
Restricted IntraFi Network account |  | $ 5,000,000 | $ 5,000,000
Finance lease |  | 45,000 | $ 98,000
Revolving credit facility |  |  |
DEBT |  |  |
Maturity of line of credit extended | 1 year |  |
Maximum borrowing capacity | $ 15,000,000 |  |
Percentage of maximum borrowing capacity on eligible accounts receivable | 80.00% |  |
Percentage of maximum borrowing capacity on deposit with lender | 100.00% |  |
Restricted IntraFi Network account | $ 5,000,000 |  |
Available for withdrawal |  | $ 10,300,000 |
Commitment fee (as a percent) | 0.10% |  |
Minimum tangible net worth | $ 55,000,000 |  |
Revolving credit facility | Minimum |  |  |
DEBT |  |  |
Interest rate (as a percent) | 3.50% |  |
Revolving credit facility | Maximum |  |  |
DEBT |  |  |
Interest rate (as a percent) | 6.00% |  |
Dominion Letters of Credit |  |  |
DEBT |  |  |
Number of letters of credit | item |  | 1 |
Amount of letter of credit |  | $ 265,000 |
Notes payable to finance companies for insurance |  |  |
DEBT |  |  |
Interest rate (as a percent) |  | 4.99% | 4.99%
Number of notes payable | instrument |  | 2 |
Total insurance premiums |  | $ 265,000 |

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