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Deferred Revenues
9 Months Ended
Sep. 30, 2018
Revenue Recognition [Abstract]  
Deferred Revenues
Deferred Revenues
Short-term deferred revenues of $87.8 million and $78.8 million include deferred revenues from product sales and service contracts, net of deferred cost of sales of $14.9 million and $16.9 million as of September 30, 2018 and December 31, 2017, respectively. The short-term deferred revenues from product sales relate to delivered and invoiced products, pending installation and acceptance, expected to occur within the next twelve months.
Long-term deferred revenues include deferred revenues from service contracts of $10.6 million as of both September 30, 2018 and December 31, 2017.