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Debt | 12 Months Ended
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Dec. 31, 2022
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Debt | 6. Debt Dominion Loan Agreement On September 30, 2019, the Company entered into a Loan and Security Agreement with Dominion Bank. On September 30, 2022, the Company entered into a Third Loan Modification Agreement to the Loan and Security Agreement for the purpose of (a) amending and extending the maturity of its line of credit with Dominion Bank by one year, (b) amending the principal amount under the Loan Agreement, (c) amending the interest rate under the Loan Agreement, (d) amending the Company’s obligation to maintain a certain tangible net worth and (e) adding the Company’s obligation to maintain a minimum liquidity amount. The Loan Agreement provides for a secured revolving credit facility in an amount up to the lesser of (i) $10,000,000 or (ii) a sum equal to (a) 80% of the Company’s eligible accounts receivable plus (b) 100% of the amount on deposit with Dominion Bank in the Company’s collateral account, including a restricted IntraFi Network Deposit account of $5,000,000. As of December 31, 2022, the Company has not borrowed any amounts under the Revolving Credit Facility and has approximately $9,017,000 available for withdrawal. Under the Revolving Credit Facility, interest will accrue at an annual rate equal to the lesser of (i) 7.75% and (ii) the greater of (a) the prime rate as published from time to time in The Wall Street Journal or (b) 4.75%. The Company will pay a commitment fee of 0.10% per annum on the difference of (a) $10,000,000 minus the Deposit minus (b) the daily average usage of the Revolving Credit Facility. The Loan Agreement contains customary covenants for credit facilities of this type, including limitations on disposition of assets. The Company is also obligated to meet certain financial covenants under the Loan Agreement, including maintaining a tangible net worth of not less than $38,000,000 and, to be tested as of the end of each calendar quarter, unencumbered liquid assets of not less than $5,000,000, and specified ratios with respect to current assets and liabilities and debt to tangible net worth. The Company received a limited waiver from Dominion Bank with respect to any non-compliance with the tangible net worth covenant for the period ended December 31, 2022. The Company’s obligations under the Loan Agreement are secured by a security interest in the collateral account (including the Deposit) with Dominion Bank and future accounts receivable and related collateral. The maturity date of the Loan Agreement is September 30, 2023. The Company does not currently have any notes payable under the Revolving Credit Facility. Dominion Letters of Credit As of December 31, 2022, Dominion Bank has issued one letter of credit in the amount of $265,000 to support the Company’s workers compensation insurance. The letter of credit is secured by a certificate of deposit with Dominion Bank. Other Indebtedness As of December 31, 2022, the Company has one note payable to a finance company for various insurance premiums totaling $205,000. In addition, the Company leases certain seismic recording equipment and vehicles under leases classified as finance leases. The Company’s Consolidated Balance Sheets as of December 31, 2022 and 2021 include finance leases of $277,000 and $45,000, respectively. Maturities of Debt The Company’s aggregate principal amount (in thousands) of outstanding notes payable and the interest rates and monthly payments as of December 31, 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 | ​ | December 31, 2021
Notes payable to finance company for insurance | ​ | ​ | ​ | ​ | ​ | ​
Aggregate principal amount outstanding | ​ | $ | 205 | ​ | $ | 265
Interest rate | ​ | ​ | 8.24% | ​ | ​ | 4.99%
​ The Company’s aggregate maturities of finance leases (in thousands) at December 31, 2022 are as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
January 2023 - December 2023 | ​ | $ | 70 | ​ | ​ | ​
January 2024 - December 2024 | ​ | ​ | 68 | ​ | ​ | ​
January 2025 - December 2025 | ​ | ​ | 139 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations under finance leases | ​ | $ | 277 | ​ | ​ | ​
​ Interest rates on these leases ranged from 5.37% to 7.66%.

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