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Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Summary of Debt
The Company’s notes payable balance consisted of the following (in thousands):
 
 
December 31,
 
 
2015
 
2014
Notes payable, principal
 
$
9,505

 
$
5,000

Add: accretion of final payment fee
 
171

 
16

Less: unamortized debt discount
 
(201
)
 
(237
)
 
 
9,475

 
4,779

Less: current portion of notes payable, net
 
(9,475
)
 
(153
)
 
 
$
—

 
$
4,626
Schedule of Future Contractual Maturities and Interest Payments
Future contractual maturities under the term loans as of December 31, 2015 are as follows (in thousands):
2016
 
$
3,113

2017
 
3,371

2018
 
3,021

 
 
$
9,505