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Debt (Tables)
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Components of Debt Balance The following table presents the carrying value of the Company's debt balance (in thousands): 
June 30, 2022December 31, 2021
Face value of outstanding convertible notes$800,000 $800,000 
Debt issuance costs, unamortized(16,023)(11,539)
Discount on debt— (221,873)
Debt, long-term$783,977 $566,588 
Schedule of Future Principal Repayments of Debt
As of June 30, 2022, future principal repayments of the notes for each of the years through maturity were as follows (in thousands):
 
Year Ending December 31: 
2022$— 
2023— 
2024— 
2025225,000 
2026— 
2027 and thereafter575,000 
 $800,000 
Summary of Interest Expense
Interest expense related to debt and finance leases for the three and six months ended June 30, 2022 and 2021 is as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Contractual interest expense$2,062 $2,052 $4,125 $4,021 
Amortization of debt issuance costs821 457 1,643 807 
Accretion of debt discount— 7,482 — 12,389 
Total convertible debt interest expense2,883 9,991 5,768 17,217 
Finance lease interest expense474 328 880 661 
   Interest expense$3,357 $10,319 $6,648 $17,878