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Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Product Warranties Disclosures [Abstract]    
Beginning balance $ 760 $ 824
Warranty provisions 81 59
Warranty claims (147) (115)
Adjustments to preexisting warranties (84) (102)
Ending balance $ 610 $ 666