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Deferred Revenue	12 Months Ended
Deferred Revenue	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred Revenue	Deferred Revenues Short-term deferred revenues of $81.8 million and $78.8 million include deferred revenues from product sales and service contracts, net of deferred cost of sales of $11.1 million and $16.9 million as of December 31, 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 December 31, 2018 and December 31, 2017.