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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2016
Convertible Senior Notes  
Summary of convertible notes

 

Liability component

 

June 30, 2016

 

December 31, 2015

 

Principal

 

$
150,000

 

$
150,000

 

Less: Debt issuance costs

 
(2,613

)
(2,760

)

Less: Debt discount, net(1)

 
(52,451

)
(55,392

)

 

 

 

 

 

 

Net carrying amount

 

$
94,936

 

$
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

 

 

 

Three Months Ended June 30,

 

Six Months Ended June 30,

 

 

 

2016

 

2015

 

2016

 

2015

 

Contractual interest expense

 

$
1,125 

 

$

—

 

$
2,241 

 

$

—

 

Amortization of debt issuance costs

 
75 

 

—

 
147 

 

—

 

Amortization of debt discount

 
1,495 

 

—

 
2,941 

 

—

 

 

 

 

 

 

 

 

 

 

 

Total

 

$
2,695 

 

$

—

 

$
5,329 

 

$

—

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Effective interest rate of the liability component

 
11 

%

—

 
11 

%

—