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Credit Facility and Acquisition Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
Our Credit Facility and Acquisition debt consisted of the following (in thousands):
December 31, 2021June 30, 2022
Credit Facility$155,400 $175,200 
Debt issuance costs, net of accumulated amortization of $1,324 and $1,508, respectively
(1,543)(1,699)
Total Credit Facility$153,857 $173,501 
Acquisition debt$4,500 $4,474 
Less: current portion(521)(583)
Total acquisition debt, net of current portion$3,979 $3,891 
The imputed interest expense related to our acquisition debt is as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2021202220212022
Acquisition debt imputed interest expense$93 $79 $190 $159 
The interest expense and amortization of debt discount, debt premium and debt issuance costs related to our Senior Notes are as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2021202220212022
Senior Notes interest expense$6,642 $4,230 $13,267 $8,480 
Senior Notes amortization of debt discount128 122 266 243 
Senior Notes amortization of debt premium27 — 85 — 
Senior Notes amortization of debt issuance costs53 35 127 69 
Schedule of Line of Credit Facilities he interest expense and amortization of debt issuance costs related to our Credit Facility are as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2021202220212022
Credit Facility interest expense$372 $1,314 $817 $2,161 
Credit Facility amortization of debt issuance costs99 96 217 184