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Contingencies (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Changes in the warranty liability for the six months June 30, 2017 and 2016, are summarized below:
 
Six Months Ended 
 June 30,
 
2017
 
2016
Aggregate product warranty liability at beginning of period
$
159

 
$
268

Net aggregate (benefit) related to product warranties
—

 
(109
)
Aggregate reductions for payments
—

 
—

Aggregate product warranty liability at end of period
$
159

 
$
159