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Debt - (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Summary of convertible notes
The Convertible Notes consist of the following:
Liability component
 
June 30, 2019
 
December 31, 2018
Principal
 
$
150,000

 
$
150,000

Less: Debt issuance costs
 
(1,544
)
 
(1,746
)
Less: Debt discount, net(1)
 
(30,999
)
 
(35,054
)
Net carrying amount
 
$
117,457

 
$
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 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 Convertible Notes:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Contractual interest expense
 
$
1,131

 
$
1,131

 
$
2,241

 
$
2,241

Amortization of debt issuance costs
 
103

 
93

 
202

 
182

Amortization of debt discount
 
2,074

 
1,863

 
4,055

 
3,644

Total
 
$
3,308

 
$
3,087

 
$
6,498

 
$
6,067

Effective interest rate of the liability component
 
11
%
 
11
%
 
11
%
 
11
%