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Debt (Tables)
 9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Debt
The Term Loan consisted of the following at September 30, 2017 (in thousands):
Principal
$
48,000

Less: unamortized debt discount and debt issuance costs
(4,318
)
Net carrying amount
$
43,682
Interest Expense Summary
The following table sets forth total interest expense recognized related to the Convertible Notes during the three and nine months ended September 30, 2017 and 2016 (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Contractual interest expense
$
1,564

 
$
1,650

 
$
4,864

 
$
4,950

Amortization of debt discount
2,126

 
1,980

 
6,586

 
5,940

Amortization of debt issuance costs
125

 
132

 
388

 
395

Total interest expense
$
3,815

 
$
3,762

 
$
11,838

 
$
11,285

The following table sets forth total interest expense recognized related to the Term Loan during the three and nine months ended September 30, 2017 (in thousands):
Contractual interest expense
$
435

Amortization of debt discount
139

Amortization of debt issuance costs
17

Total interest expense
$
591
Convertible Debt
The Convertible Notes consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):
 
September 30,
2017
 
December 31,
2016
Liability component:
 
 
 
Principal
$
105,125

 
$
120,000

Less: unamortized debt discount and debt issuance costs
(22,422
)
 
(29,092
)
Net carrying amount
$
82,703

 
$
90,908

Equity component
$
41,905

 
$
38,305