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Debt (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Components of Debt Balance The following table presents the carrying value of the Company's debt balance (in thousands): 
June 30, 2021December 31, 2020
Face value of outstanding convertible debt$800,000 $450,000 
 Debt issuance costs, unamortized(12,621)(5,646)
 Discount on debt(238,634)(88,036)
Debt, long-term$548,745 $356,318 
Schedule of Future Principal Repayments of Debt
As of June 30, 2021, future principal repayments of the debt for each of the years through maturity were as follows (in thousands):
 
Year Ending December 31: 
2021$— 
2022— 
2023— 
2024— 
2025225,000 
2026 and thereafter575,000 
 $800,000 
Summary of Interest Expense
Interest expense related to the 2025 Convertible Notes and 2028 Convertible Notes for the three and six months ended June 30, 2021 and 2020, which includes the contractual interest coupon payable semi-annually in cash, the amortization of the issuance costs, accretion of debt discount and finance lease interest expense is as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Contractual interest expense$2,052 $1,975 $4,021 $3,948 
Amortization of debt issuance costs457 349 807 698 
Accretion of debt discount7,482 4,713 12,389 9,363 
Total convertible debt interest expense9,991 7,037 17,217 14,009 
Finance lease interest expense328 432 661 871 
   Interest expense$10,319 $7,469 $17,878 $14,880