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Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of 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,
20202021
2026 Convertible Notes:(In thousands)
Principal$400,000 $400,000 
Unamortized discount(110,546)(92,034)
Unamortized debt issuance costs(7,258)(6,043)
2026 Convertible Notes net carrying amount$282,196 $301,923 
2028 Convertible Notes:
Principal$— $250,000 
Unamortized discount— (60,488)
Unamortized debt issuance costs— (4,995)
2028 Convertible Notes net carrying amount$— $184,517 
Total net carrying amount$282,196 $486,440 
The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:
As of December 31,
20202021
2026 Convertible Notes:(In thousands)
Proceeds allocated to the conversion options (debt discount)$125,152 $125,152 
Issuance costs(3,742)(3,742)
2026 Convertible Notes net carrying amount$121,410 $121,410 
2028 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)$— $66,908 
Issuance costs— (2,019)
2028 Convertible Notes net carrying amount$— $64,889 
Total net carrying amount$121,410 $186,299 
Schedule of Interest Income and Interest Expense Disclosure
The following table sets forth the interest expense recognized related to the 2026 and 2028 Convertible Notes:
Year ended December 31,
20202021
2026 Convertible Notes:(In thousands)
Contractual interest expense$841 $1,000 
Amortization of debt discount14,606 18,505 
Amortization of debt issuance costs959 1,214 
Total interest expense related to the 2026 Convertible Notes$16,406 $20,719 
2028 Convertible Notes:
Contractual interest expense$— $991 
Amortization of debt discount— 6,419 
Amortization of debt issuance costs— 532 
Total interest expense related to the 2028 Convertible Notes$— $7,942 
Total interest expense$16,406 $28,661