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Transactions with Olympus Corporation (Details) - USD ($)
$ in Millions
 6 Months Ended
Apr. 30, 2015
Jun. 30, 2015
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 remaining balance $ 3.2  
Interest rate on the purchase price of remaining balance (in hundredths) 6.00%  
Purchase price principal amount payable on May 8, 2015 $ 1.0  
Purchase price principal amount payable on September 30, 2015 0.5  
Purchase price principal amount payable on December 31, 2015 0.5  
Purchase price principal amount payable on March 31, 2016 0.5  
Purchase price principal amount and accrued interest payable on May 8, 2016 $ 0.7  
Acquired Olympus Ownership [Member]    
Acquisition of Olympus' Interest in the Joint Venture [Abstract]    
Extended purchase price amount in default prior to March 1, 2020   $ 16.0