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Convertible Subordinated Notes (Tables)
 12 Months Ended
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, 2020December 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, 2020December 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,
201920202021
Credit Facility interest expense$1,601 $3,738 $1,820 
Credit Facility amortization of debt issuance costs229 482 380 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Years ended December 31,
201920202021
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,
201920202021
Convertible Notes interest expense$174 $149 $18 
Convertible Notes accretion of debt discount241 216 20 
Convertible Notes amortization of debt issuance costs24 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,
201920202021
Senior Notes interest expense$21,711 $26,500 $21,767 
Senior Notes amortization of debt discount493 528 504 
Senior Notes amortization of debt premium— 221 85 
Senior Notes amortization of debt issuance costs139 280 195