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Convertible Senior Notes (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Long-term debt
The following table provides additional details on the carrying amounts of our Notes:
(in thousands)June 30, 2021December 31, 2020
Liability component:
Principal amount of Notes$230,000 $230,000 
Less: unamortized debt discount and issuance costs(76,366)(80,647)
Net carrying amount of Notes$153,634 $149,353 
Equity component — net carrying amount$75,333 $75,333 
For the three and six months ended June 30, 2021, total interest expense recognized related to our Notes consists of the following:
(in thousands)Three Months Ended June 30, 2021Six Months Ended June 30, 2021
Contractual coupon interest1,581 3,196 
Amortization of debt discount and issuance costs2,183 4,280 
Total interest expense$3,764 $7,476