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Convertible Subordinated Notes (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Our Credit Facility and acquisition debt consisted of the following (in thousands):
| December 31, 2021 |  | December 31, 2022
Credit Facility | $ | 155,400 |  |  | $ | 190,700 |
Debt issuance costs, net of accumulated amortization of $1,324 and $1,926, respectively | (1,543) |  |  | (1,864) |
Total Credit Facility | $ | 153,857 |  |  | $ | 188,836 |
Acquisition debt | $ | 4,500 |  |  | $ | 3,993 |
Less: current portion | (521) |  |  | (555) |
Total acquisition debt, net of current portion | $ | 3,979 |  |  | $ | 3,438 |
The interest expense and amortization of debt issuance costs related to our Credit Facility are as follows (in thousands):
| Years ended December 31,
| 2020 |  | 2021 |  | 2022
Credit Facility interest expense | $ | 3,738 |  |  | $ | 1,820 |  |  | $ | 7,105 |
Credit Facility amortization of debt issuance costs | 482 |  |  | 380 |  |  | 412 |
The imputed interest expense related to our acquisition debt is as follows (in thousands):
| Years ended December 31,
| 2020 |  | 2021 |  | 2022
Acquisition debt imputed interest expense | $ | 489 |  |  | $ | 364 |  |  | $ | 311 |
The interest expense and accretion of debt discount and debt issuance costs related to our Convertible Notes are as follows (in thousands):
| Years ended December 31,
| 2020 |  | 2021 |  | 2022
Convertible Notes interest expense | $ | 149 |  |  | $ | 18 |  |  | $ | — |
Convertible Notes accretion of debt discount | 216 |  |  | 20 |  |  | — |
Convertible Notes amortization of debt issuance costs | 20 |  |  | 1 |  |  | — |
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes are as follows (in thousands):
| Years ended December 31,
| 2020 |  | 2021 |  | 2022
Senior Notes interest expense | $ | 26,500 |  |  | $ | 21,767 |  |  | $ | 16,980 |
Senior Notes amortization of debt discount | 528 |  |  | 504 |  |  | 493 |
Senior Notes amortization of debt premium | 221 |  |  | 85 |  |  | — |
Senior Notes amortization of debt issuance costs | 280 |  |  | 195 |  |  | 140 |

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