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Inventories	6 Months Ended
Inventories	Jun. 30, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Included in inventories at June 30, 2018, and December 31, 2017, are $0.3 million and $0.5 million, respectively, of finished goods and $0.4 million and $0.5 million, respectively, of components.