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Business Description, Basis of Presentation and Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Value of advance replacement units $ 75 $ 47
Deferred revenue 4,549 5,004
Deferred cost of goods sold 1,628 1,698
Deferred gross profit $ 2,921 $ 3,306