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Debt (Tables)
 9 Months Ended
Sep. 30, 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 September 30,
20202021
2026 Convertible Notes:
Principal$400,000 $400,000 
Unamortized discount(110,546)(96,782)
Unamortized debt issuance costs(7,258)(6,354)
2026 Convertible Notes net carrying amount282,196 296,864 
2028 Convertible Notes:
Principal— 250,000 
Unamortized discount— (62,542)
Unamortized debt issuance costs— (5,167)
2028 Convertible Notes net carrying amount— 182,291 
Total net carrying amount$282,196 $479,155 
The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:
As of December 31,As of September 30,
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— (2,019)
2028 Convertible Notes net carrying amount— 64,889 
Total net carrying amount$121,410 $186,299 
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 September 30,Nine months ended September 30,
2020202120202021
2026 Convertible Notes:
Contractual interest expense$246 $250 $591 $750 
Amortization of debt discount4,292 4,664 10,183 13,761 
Amortization of debt issuance costs283 306 669 903 
Total interest expense related to the 2026 Convertible Notes4,821 5,220 11,443 15,414 
2028 Convertible Notes:
Contractual interest expense— 313 — 678 
Amortization of debt discount— 2,029 — 4,366 
Amortization of debt issuance costs— 168 — 362 
Total interest expense related to the 2028 Convertible Notes— 2,510 — 5,406 
Total interest expense$4,821 $7,730 $11,443 $20,820