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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Term Loan and Derivative Liability
 
 
June 30, 2017
 
 
December 31, 2016
(in thousands)
 
Face Value

Fair Value

Carrying Amount
 
 
Face Value
 
Fair Value
 
Carrying Amount
Term Loan
 
$
6,500

 
$
6,141

 
$
5,739

 
 
$
5,000

 
$
4,865

 
$
2,218