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Business Description, Basis of Presentation and Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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

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