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Inventories	3 Months Ended
Inventories	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Included in inventories at March 31, 2018, and December 31, 2017, are $0.5 million and $0.5 million, respectively, of finished goods and $0.3 million and $0.5 million, respectively, of components.