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Notes Payable, Preferred Stock and Stock Purchase Warrants (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Payable, Preferred Stock and Stock Purchase Warrants |
Schedule of carrying amounts outstanding under the Company's notes payable | The following carrying amounts were outstanding under the Company’s notes payable as of September 30, 2024 and December 31, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | September 30, 2024
​ | Principal ($) | ​ | Debt (Discount) Premium ($)⁽¹⁾ | ​ | Issuance Costs ($) | ​ | Carrying Amount ($)
2025 Notes | 20,399 | ​ | (1,006) | ​ | (17) | ​ | 19,376
Loan and Security Agreement | 35,000 | ​ | (280) | ​ | (272) | ​ | 34,448
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, 2023
​ | Principal ($) | ​ | Debt (Discount) Premium ($)⁽¹⁾ | ​ | Issuance Costs ($) | ​ | Carrying Amount ($)
2025 Notes | 20,399 | ​ | (3,090) | ​ | (52) | ​ | 17,257
Loan and Security Agreement | 25,000 | ​ | (733) | ​ | (329) | ​ | 23,938
| (1) | Includes accretion of end of term fees payable at maturity
Schedule of interest expense related to the notes payable | Interest expense related to the notes payable for the nine months ended September 30, 2024 and 2023 was as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine Months Ended September 30, 2024
​ | Interest Rate | ​ | Interest ($) | ​ | Debt Discount and Fees ($)⁽¹⁾ | ​ | Issuance Costs ($) | ​ | Total Interest Expense ($)
2025 Notes | 5.25% | ​ | 803 | ​ | 2,083 | ​ | 35 | ​ | 2,921
Loan and Security Agreement | 9.90% | ​ | 2,635 | ​ | 651 | ​ | 59 | ​ | 3,345
Total | ​ | ​ | 3,438 | ​ | 2,734 | ​ | 94 | ​ | 6,266
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine Months Ended September 30, 2023
​ | Interest Rate | ​ | Interest ($) | ​ | Debt Discount and Fees ($)⁽¹⁾ | ​ | Issuance Costs ($) | ​ | Total Interest Expense ($)
2023 Notes | 5.25% | ​ | 69 | ​ | 120 | ​ | - | ​ | 189
2025 Notes | 5.25% | ​ | 1,881 | ​ | 4,808 | ​ | 81 | ​ | 6,770
PHC Notes | 8.00% | ​ | 700 | ​ | 1,442 | ​ | 88 | ​ | 2,230
Loan and Security Agreement | 9.90% | ​ | 158 | ​ | 38 | ​ | 3 | ​ | 199
Total | ​ | ​ | 2,808 | ​ | 6,408 | ​ | 172 | ​ | 9,388
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
| (1) | Includes accretion of end of term fees payable at maturity
Schedule of future maturities | The following are the scheduled maturities of the Company’s notes payable (including end of term fees) as of September 30, 2024 (in thousands): ​
​ | ​ | ​ | ​
2025 | ​ | ​ | 20,399
2026 | ​ | ​ | 12,996
2027 | ​ | ​ | 24,437
Total |  | $ | 57,832
​

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