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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Commitments And Contingencies Details    
Balance, January 1 $ 17 $ 17
Accruals for warranties issued 9 10
Settlements made (in cash or in kind) (7) (6)
Balance, end of period $ 19 $ 21