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Commitments and Contingencies - Reconciliation of Changes in Accrued Warranties and Related Costs (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance $ 952 $ 1,265
Charged to cost of revenue 371 208
Claims and settlements (480) (507)
Ending balance $ 843 $ 966