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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 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 September 30, 2020As of December 31, 2019
2023 Notes2024 Notes2026 Notes2023 Notes2024 Notes2026 Notes
Liability:
Principal$84,748 $400,000 $400,000 $84,759 $400,000 $400,000 
Less: debt discount and issuance costs, net of amortization(13,281)(61,857)(87,592)(16,605)(72,669)(97,010)
Net carrying amount$71,467 $338,143 $312,408 $68,154 $327,331 $302,990 
Equity, net of issuance costs$46,473 $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 September 30,Nine Months Ended September 30,
2020201920202019
Contractual interest expense$1,606 $1,005 $4,818 $1,580 
Amortization of debt issuance costs and discount7,992 5,436 23,552 10,949 
Total$9,598 $6,441 $28,370 $12,529