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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Net Carrying Amount of Liability and Equity Component of Notes
The net carrying amount of the liability components of the 2026 and 2028 Convertible Notes were as follows:
As of December 31,As of March 31,
20202021
2026 Convertible Notes:
Principal$400,000 $400,000 
Unamortized discount(110,546)(106,036)
Unamortized debt issuance costs(7,258)(6,962)
2026 Convertible Notes net carrying amount282,196 287,002 
2028 Convertible Notes:
Principal— 250,000 
Unamortized discount— (66,575)
Unamortized debt issuance costs— (5,579)
2028 Convertible Notes net carrying amount— 177,846 
Total net carrying amount$282,196 $464,848 

The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:
As of December 31,As of March 31,
20202021
2026 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)$125,152 $125,152 
Issuance costs(3,742)(3,742)
2026 Convertible Notes net carrying amount121,410 121,410 
2028 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)— 66,908 
Issuance costs— (2,049)
2028 Convertible Notes net carrying amount— 64,859 
Total net carrying amount$121,410 $186,269 
Interest Income and Interest Expense Disclosure
The following table sets forth the interest expense recognized related to the 2026 and 2028 Convertible Notes:
Three months ended March 31,
20202021
2026 Convertible Notes:
Contractual interest expense$96 $250 
Amortization of debt discount1,629 4,510 
Amortization of debt issuance costs106 296 
Total interest expense related to the 2026 Convertible Notes1,831 5,056 
2028 Convertible Notes:
Contractual interest expense— 52 
Amortization of debt discount— 333 
Amortization of debt issuance costs— 28 
Total interest expense related to the 2028 Convertible Notes— 413 
Total interest expense$1,831 $5,469