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Debt - (Tables)
 6 Months Ended
Jun. 30, 2020
1.50% Convertible senior notes due 2026  
Debt Instrument, Redemption [Line Items]  
Summary of convertible notes
The 2026 Convertible Notes consist of the following:
Liability componentJune 30, 2020December 31, 2019
Principal$287,500  $287,500  
Less: Debt issuance costs(4,319) (4,567) 
Less: Debt discount, net(1)(112,877) (119,350) 
Net carrying amount$170,304  $163,583  
(1) Included in the consolidated balance sheets within convertible senior notes (due 2026) and amortized to interest expense over the remaining life of the 2026 Convertible Notes using the effective interest rate method.
Summary of interest expense recognized related to the Convertible Notes
The following table sets forth total interest expense recognized related to the 2026 Convertible Notes:
Three Months Ended June 30,Six Months Ended June 30,
 20202020
Contractual interest expense$1,066  $2,142  
Amortization of debt issuance costs124  248  
Amortization of debt discount3,239  6,473  
Total$4,429  $8,863  
Effective interest rate of the liability component10.2 %10.2 %
3.00% Convertible senior notes due 2022  
Debt Instrument, Redemption [Line Items]  
Summary of convertible notes
The 2022 Convertible Notes consist of the following:
Liability componentJune 30, 2020December 31, 2019
Principal$150,000  $150,000  
Less: Debt issuance costs(1,104) (1,329) 
Less: Debt discount, net(1)(22,166) (26,686) 
Net carrying amount$126,730  $121,985  
(1) Included in the consolidated balance sheets within convertible senior notes (due 2022) and amortized to interest expense over the remaining life of the 2022 Convertible Notes using the effective interest rate method.
Summary of interest expense recognized related to the Convertible Notes
The following table sets forth total interest expense recognized related to the 2022 Convertible Notes:
 Three Months Ended June 30,Six Months Ended June 30,
 2020201920202019
Contractual interest expense$1,125  $1,131  $2,244  $2,241  
Amortization of debt issuance costs114  103  225  202  
Amortization of debt discount2,295  2,074  4,520  4,055  
Total$3,534  $3,308  $6,989  $6,498  
Effective interest rate of the liability component11.0 %11.0 %11.0 %11.0 %