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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Summary of convertible notes
 
The Convertible Notes consist of the following:
 
Liability component
 
September 30, 2016
 
December 31, 2015
Principal
 
$
150,000

 
$
150,000

Less: Debt issuance costs
 
(2,536
)
 
(2,760
)
Less: Debt discount, net(1)
 
(50,905
)
 
(55,392
)
Net carrying amount
 
$
96,559

 
$
91,848

 
(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 September 30,
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Contractual interest expense
 
$
1,131

 
$
584

 
$
3,372

 
$
584

Amortization of debt issuance costs
 
77

 
37

 
224

 
37

Amortization of debt discount
 
1,546

 
736

 
4,487

 
736

Total
 
$
2,754

 
$
1,357

 
$
8,083

 
$
1,357

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