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Convertible Subordinated Notes (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Convertible Subordinated Notes, Carrying Values of Liability and Equity Components | The carrying values of the liability and equity components of the Convertible Notes are reflected on our Consolidated Balance Sheet as follows (in thousands):
| December 31, 2020 |  | December 31, 2021
Long-term liabilities: |  |  |
Principal amount | $ | 2,559 |  |  | $ | — |
Unamortized discount of liability component | (20) |  |  | — |
Convertible Notes issuance costs, net of accumulated amortization of $63 | (1) |  |  | — |
Carrying value of the liability component | $ | 2,538 |  |  | $ | — |
Carrying value of the equity component | $ | 319 |  |  | $ | — |
Schedule of Long-term Debt Instruments | Our Credit Facility and Acquisition debt consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2021
Credit Facility | $ | 47,200 |  |  | $ | 155,400 |
Debt issuance costs, net of accumulated amortization of $819 and $1,324, respectively | (1,136) |  |  | (1,543) |
Total Credit Facility | $ | 46,064 |  |  | $ | 153,857 |
Acquisition debt | $ | 5,509 |  |  | $ | 4,500 |
Less: current portion | (1,027) |  |  | (521) |
Total acquisition debt, net of current portion | $ | 4,482 |  |  | $ | 3,979 |
The interest expense and amortization of debt issuance costs related to our Credit Facility are as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Credit Facility interest expense | $ | 1,601 |  |  | $ | 3,738 |  |  | $ | 1,820 |
Credit Facility amortization of debt issuance costs | 229 |  |  | 482 |  |  | 380 |
The imputed interest expense related to our acquisition debt is as follows (in thousands):
| Years ended December 31,
| 2019 |  | 2020 |  | 2021
Acquisition debt imputed interest expense | $ | 622 |  |  | $ | 489 |  |  | $ | 364 |
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,
| 2019 |  | 2020 |  | 2021
Convertible Notes interest expense | $ | 174 |  |  | $ | 149 |  |  | $ | 18 |
Convertible Notes accretion of debt discount | 241 |  |  | 216 |  |  | 20 |
Convertible Notes amortization of debt issuance costs | 24 |  |  | 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,
| 2019 |  | 2020 |  | 2021
Senior Notes interest expense | $ | 21,711 |  |  | $ | 26,500 |  |  | $ | 21,767 |
Senior Notes amortization of debt discount | 493 |  |  | 528 |  |  | 504 |
Senior Notes amortization of debt premium | — |  |  | 221 |  |  | 85 |
Senior Notes amortization of debt issuance costs | 139 |  |  | 280 |  |  | 195 |

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