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Debt - (Tables)
 9 Months Ended
Sep. 30, 2019
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 component
 
September 30, 2019
Principal
 
$
287,500

Less: Debt issuance costs
 
(4,692
)
Less: Debt discount, net(1)
 
(122,618
)
Net carrying amount
 
$
160,190

 
(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 September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2019
Contractual interest expense
 
$
130

 
$
130

Amortization of debt issuance costs
 
15

 
15

Amortization of debt discount
 
391

 
391

Total
 
$
536

 
$
536

Effective interest rate of the liability component
 
10.2
%
 
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 component
 
September 30, 2019
 
December 31, 2018
Principal
 
$
150,000

 
$
150,000

Less: Debt issuance costs
 
(1,438
)
 
(1,746
)
Less: Debt discount, net(1)
 
(28,862
)
 
(35,054
)
Net carrying amount
 
$
119,700

 
$
113,200

 
(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 September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Contractual interest expense
 
$
1,134

 
$
1,134

 
$
3,375

 
$
3,375

Amortization of debt issuance costs
 
106

 
95

 
308

 
277

Amortization of debt discount
 
2,137

 
1,919

 
6,192

 
5,563

Total
 
$
3,377

 
$
3,148

 
$
9,875

 
$
9,215

Effective interest rate of the liability component
 
11.0
%
 
11.0
%
 
11.0
%
 
11.0
%