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Restructuring (Tables)
 3 Months Ended
Mar. 31, 2017
Restructuring Charges [Abstract]  
Schedule of restructuring charges related to work-force reduction
 
 
Balance as of
December 31,
2016
 
Expenses,
net
 
Cash payments
 
Balance as of
March 31, 2017
2016 workforce reduction
 
$
22

 
$
—

 
$
(22
)
 
$
—