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Transactions with Olympus Corporation (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 30, 2015	Mar. 31, 2016
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Total purchase price	$ 6.0
Purchase price payment agreement term		2 years
Amendment One to Joint Venture Termination Agreement [Member]
Acquisition of Olympus' Interest in the Joint Venture [Abstract]
Purchase price payment termination agreement total	4.2
Purchase price principal amount payable on January 31, 2016	0.5
Purchase price principal amount payable on April 30, 2016	0.5
Purchase price principal amount and accrued interest payable on May 8, 2016	$ 0.8

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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