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Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of product warranty activity    
Beginning balance $ 1,853 $ 1,269
Charges to expense 1,431 2,048
Costs incurred (1,404) (1,464)
Ending balance $ 1,880 $ 1,853
Minimum    
Product Liability Contingency [Line Items]    
Limited product warranty period 1 year  
Maximum    
Product Liability Contingency [Line Items]    
Limited product warranty period 2 years