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Debt (Details) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 | Dec. 31, 2020 instrument | Dec. 31, 2020 item | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
DEBT |  |  |  |  |  |  |
Finance lease |  |  | $ 98,000 |  |  |  | $ 2,412,000
Dominion Loan Agreement |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Maturity of line of credit extended | 1 year |  |  |  |  |  |
Maximum borrowing capacity | $ 15,000,000 | $ 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 CDARS account | $ 5,000,000 |  |  |  |  |  |
Commitment fee (as a percent) |  | 0.10% |  |  |  |  |
Minimum tangible net worth |  | $ 75,000,000 |  |  |  |  |
Dominion Loan Agreement | Minimum |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.50% |  |  |  |  |
Dominion Loan Agreement | Maximum |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.00% |  |  |  |  |
Dominion Letters of Credit |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Number of letters of credit |  |  |  | 1 |  | 1 |
Amount of letter of credit |  |  | 583,000 |  |  |  |
Notes payable to finance companies for insurance |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.99% |  |  |
Number of notes payable | instrument |  |  |  |  | 1 |  |
Total insurance premiums |  |  | $ 40,000 |  |  |  |
Notes payable to finance companies for insurance | Minimum |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.05%
Notes payable to finance companies for insurance | Maximum |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.99%

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- Definition Extended maturity period of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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