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Restructuring (Tables)
 6 Months Ended
Jun. 30, 2017
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs
The following table summarizes accrued restructuring costs as of June 30, 2017:
 
 
 
Employee Severance
 
 
 
and Other Benefits
 
Balance at December 31, 2016
 
$
-
 
Restructuring charges
 
 
665
 
Cash payments
 
 
(384)
 
Stock based compensation expense
 
 
(186)
 
Balance at June 30, 2017
 
$
95