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Convertible Senior Notes (Tables)
 9 Months Ended
Sep. 30, 2015
Convertible Senior Notes.  
Summary of convertible notes

 

Liability component

 

September 30,
2015

 

December 31,
2014

 

 

 

(in thousands)

 

Principal

 

$
150,000

 

$

—

 

Less: Debt discount, net(1)

 
(56,802

)

—

 

 

 

 

 

 

 

Net carrying amount

 

$
93,198

 

$

—

 

 

 

 

 

 

 

 

 

 

 

(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

 

 

 

Three Months Ended September
30,

 

 

 

2015

 

2014

 

 

 

(in thousands)

 

Contractual interest expense

 

$
584 

 

$

—

 

Amortization of debt issuance costs

 
37 

 

—

 

Amortization of debt discount

 
736 

 

—

 

Total

 

$
1,357 

 

$

—

 

Effective interest rate of the liability component

 
11.0 

%

—