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Long-Term Debt
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt
Total convertible notes payable consisted of the following (in thousands):
June 30, 2023December 31, 2022
Current portion:
3.75% Convertible notes due 2023
$— $325,000 
Unamortized debt issuance costs— (119)
Total current convertible notes payable$— $324,881 
Non-current portion:
5.00% Convertible notes due 2027
$175,250 $175,250 
Unamortized debt issuance costs and discount(8,002)(8,784)
Total non-current convertible notes payable$167,248 $166,466 
In February 2023, the Company repaid the outstanding principal amount of $325.0 million on its 3.75% Convertible notes due in 2023, together with accrued but unpaid interest on the maturity date. The repayment was funded by the issuance of the 5.00% Convertible notes due 2027 and the concurrent common stock offering in December 2022, as well as cash on hand. The effective interest rate of the 2027 Convertible notes is 6.2%.
The interest expense incurred in connection with the convertible notes payable consisted of the following (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Coupon interest $2,191 $3,047 $5,397 $6,094 
Amortization of debt issuance costs391 356 900 712 
Total interest expense on convertible notes payable$2,582 $3,403 $6,297 $6,806