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Debt (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Components of Debt Balance The following table presents the carrying value of the Company's debt balance (in thousands):
 
June 30, 2020December 31, 2019
 1.75% convertible senior notes due 2025
$450,000  $450,000  
 Debt issuance costs, unamortized(6,345) (7,043) 
 Discount on debt(97,654) (107,017) 
Debt, long-term$346,001  $335,940  
Schedule of Future Principal Repayments of Debt
As of June 30, 2020, future principal repayments of the debt for each of the fiscal years through maturity were as follows (in thousands):
 
Year Ending December 31: 
2020$—  
2021—  
2022—  
2023—  
2024—  
2025450,000  
 $450,000  
Summary of Interest Expense
Interest expense related to the Convertible Notes for the three and six months ended June 30, 2020 and June 30, 2019, 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,
2020201920202019
Contractual interest expense$1,975  $1,970  $3,948  $3,941  
Amortization of debt issuance costs349  349  698  698  
Accretion of debt discount4,713  4,466  9,363  8,872  
Total convertible debt interest expense7,037  6,785  14,009  13,511  
Finance lease interest expense432  —  871  —  
Total interest expense$7,469  $6,785  $14,880  $13,511