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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Term Loan
The Term Loan consists of the following (in thousands):
 
September 30,
2018
 
December 31, 2017
Principal
$
47,500

 
$
48,000

Less: unamortized debt discount and debt issuance costs
(2,827
)
 
(3,945
)
Net carrying amount
$
44,673

 
$
44,055
Interest Expense Summary
The following table sets forth total interest expense recognized related to the Term Loan (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Contractual interest expense
$
1,185

 
$
435

 
$
3,452

 
$
435

Amortization of debt discount
332

 
139

 
998

 
139

Amortization of debt issuance costs
40

 
17

 
120

 
17

Total interest expense
$
1,557

 
$
591

 
$
4,570

 
$
591

The following table sets forth total interest expense recognized related to the Convertible Notes (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Contractual interest expense
$
1,446

 
$
1,564

 
$
4,337

 
$
4,864

Amortization of debt discount
1,955

 
2,126

 
5,866

 
6,586

Amortization of debt issuance costs
115

 
125

 
344

 
388

Total interest expense
$
3,516

 
$
3,815

 
$
10,547

 
$
11,838
Convertible Debt
The Convertible Notes consist of the following (in thousands):
 
September 30,
2018
 
December 31,
2017
Liability component:
 
 
 
Principal
$
105,125

 
$
105,125

Less: unamortized debt discount and debt issuance costs
(14,142
)
 
(20,352
)
Net carrying amount
$
90,983

 
$
84,773

Equity component
$
41,905

 
$
41,905