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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Long-term debt
The following table provides additional details on the carrying amounts of the Notes:
(in thousands)September 30, 2021December 31, 2020
Liability component:
Principal amount of Notes$230,000 $230,000 
Less: unamortized debt discount and issuance costs(74,129)(80,647)
Net carrying amount of Notes$155,871 $149,353 
Equity component — net carrying amount$75,333 $75,333 
For the three and nine months ended September 30, 2021, total interest expense recognized related to the Notes consists of the following:
(in thousands)Three Months Ended
September 30, 2021
Nine Months Ended
September 30, 2021
Contractual coupon interest1,581 4,777 
Amortization of debt discount and issuance costs2,238 6,518 
Total interest expense$3,819 $11,295