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Convertible Notes (Tables)
 6 Months Ended
Jun. 30, 2017
Convertible Notes.  
Schedule of convertible note interest expense

The following table presents total interest expense recognized related to the Convertible Notes during the three and six months ended June 30, 2016 and 2017 (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended June 30,

 

Six Months Ended June 30,

 

    

2016

    

2017

    

2016

    

2017

Contractual interest expense

 

$

1,509

 

$

1,509

 

$

3,019

 

$

3,019

Amortization of debt discount

 

 

2,461

 

 

2,779

 

 

4,775

 

 

5,394

Amortization of debt issuance costs

 

 

150

 

 

136

 

 

307

 

 

279

Total interest expense

 

$

4,120

 

$

4,424

 

$

8,101

 

$

8,692