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Long-Term Debt, Net (Tables)
9 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
Net Carrying Amounts of our Convertible Notes
The carrying amount and fair value of our Convertible Notes were as follows (in thousands).
September 30,
2024
December 31,
2023
Principal amount
2027 Convertible Notes$805,000 $805,000 
2028 Convertible Notes720,000 720,000 
Total principal amount
$1,525,000 $1,525,000 
Unamortized debt discount
2027 Convertible Notes$(8,378)$(10,950)
2028 Convertible Notes(12,468)(14,802)
Total unamortized debt discount$(20,846)$(25,752)
Carrying amount
2027 Convertible Notes$796,622 $794,050 
2028 Convertible Notes707,532 705,198 
Total carrying amount$1,504,154 $1,499,248 
Fair value based on trading levels (Level 2)
2027 Convertible Notes$807,721 $695,826 
2028 Convertible Notes853,754 670,522 
Total fair value of outstanding notes$1,661,475 $1,366,348 
Remaining amortization per period of debt discount (in years)
2027 Convertible Notes2.43.2
2028 Convertible Notes3.94.6
Schedule of Interest Income and Interest Expense Disclosure
The following table summarizes the components of interest expense and the effective interest rates for each of our Convertible Notes (in thousands).
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Coupon interest
2024 Convertible Notes$$$$36
2027 Convertible Notes5035031,5091,509
2028 Convertible Notes1,8001,8005,4005,400
Total coupon interest$2,303$2,303$6,909$6,945
Amortization of debt discount
2024 Convertible Notes$$$$24
2027 Convertible Notes8598532,5722,555
2028 Convertible Notes7817702,3342,301
Total amortization of debt discount$1,640$1,623$4,906$4,880
Interest expense
2024 Convertible Notes$$$$60
2027 Convertible Notes1,3621,3564,0814,064
2028 Convertible Notes2,5812,5707,7347,701
Total interest expense$3,943$3,926$11,815$11,825
Effective interest rates
2027 Convertible Notes0.7 %0.7 %0.7 %0.7 %
2028 Convertible Notes1.5 %1.5 %1.5 %1.5 %