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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Convertible Debt
The net carrying amount of the liability component of the Notes was as follows:
March 31, 2021December 31, 2020
(in thousands)
Principal$575,000 $575,000 
Unamortized debt discount(176,106)(184,674)
Unamortized debt issuance costs(6,648)(7,051)
Carrying amount of the liability component, net$392,246 $383,275 

The net carrying amount of the equity component of the Notes was as follows:
March 31, 2021December 31, 2020
(in thousands)
Proceeds allocated to the conversion option (debt discount)$205,290 $205,290 
Less: allocated issuance costs(4,478)(4,478)
Carrying amount of the equity component, net$200,812 $200,812 
Schedule of Interest Expense
The following table sets forth total interest expense recognized related to the Notes:
Three Months Ended March 31,
20212020
(in thousands)
Coupon interest expense$1,078 $— 
Amortization of debt discount8,568 — 
Amortization of debt issuance costs403 — 
Total$10,049 $—