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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Fair value of derivative liability
 
 
December 31, 2016
 
 
December 31, 2015
(in thousands)
 
Face Value
 
Fair Value
 
Carrying Amount
 
 
Face Value
 
Fair Value
 
Carrying Amount
Term Loan
 
$
5,000

 
$
4,865

 
$
2,218

 
 
$
5,000

 
$
3,837

 
$
2,052

Derivative liability
 
$
—

 
$
—

 
$
—

 
 
$
1,250

 
$
828

 
$
828