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Debt (Tables)
 3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Summary of Debt
The Company’s notes payable balance consisted of the following (in thousands):
 
 
March 31,
2015
 
December 31,
2014
Notes payable, principal
 
$
5,000

 
$
5,000

Add: accretion of final payment fee
 
40

 
16

Less: unamortized debt discount
 
(215
)
 
(237
)
 
 
4,825

 
4,779

Less: current portion of notes payable, net
 
(531
)
 
(153
)
 
 
$
4,294

 
$
4,626