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Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Summary of convertible notes
 
The Convertible Notes consist of the following:
 
Liability component
 
June 30, 2017
 
December 31, 2016
Principal
 
$
150,000

 
$
150,000

Less: Debt issuance costs
 
(2,294
)
 
(2,457
)
Less: Debt discount, net(1)
 
(46,054
)
 
(49,327
)
Net carrying amount
 
$
101,652

 
$
98,216

 
(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,
 
 
2017
 
2016
 
2017
 
2016
Contractual interest expense
 
$
1,131

 
$
1,125

 
$
2,241

 
$
2,241

Amortization of debt issuance costs
 
83

 
75

 
163

 
147

Amortization of debt discount
 
1,674

 
1,495

 
3,274

 
2,941

Total
 
$
2,888

 
$
2,695

 
$
5,678

 
$
5,329

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