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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Summary of Convertible Debt
The following table presents details of our convertible senior notes, which are further discussed below (original principal in thousands):
Month IssuedMaturity DateOriginal Principal (including over-allotment)Coupon Interest RateEffective Interest RateConversion RateInitial Conversion Price
2023 NotesMay and June 2018June 1, 2023$230,000  0.5 %7.00 %$22.5572  $44.33  
2024 NotesAugust 2019August 1, 2024$400,000  0.5 %4.96 %$5.2809  $189.36  
2026 NotesAugust 2019August 1, 2026$400,000  1.0 %5.41 %$5.2809  $189.36  
The Notes consisted of the following (in thousands):
As of June 30, 2020As of December 31, 2019
2023 Notes2024 Notes2026 Notes2023 Notes2024 Notes2026 Notes
Liability:
Principal$84,759  $400,000  $400,000  $84,759  $400,000  $400,000  
Less: debt discount and issuance costs, net of amortization(14,414) (65,521) (90,789) (16,605) (72,669) (97,010) 
Net carrying amount$70,345  $334,479  $309,211  $68,154  $327,331  $302,990  
Equity, net of issuance costs$46,474  $69,749  $93,380  $46,474  $69,749  $93,380  
Summary of Interest Expense
The following table sets forth interest expense recognized related to the Notes (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Contractual interest expense$1,606  $288  $3,212  $575  
Amortization of debt issuance costs and discount7,885  2,814  15,560  5,513  
Total$9,491  $3,102  $18,772  $6,088