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Investments in Joint Ventures - S & I Ophthalmic - Additional Information (Details)
1 Months Ended 33 Months Ended
Oct. 31, 2013
USD ($)
Jun. 30, 2016
USD ($)
board_seat
Dec. 31, 2015
USD ($)
Schedule Of Investments In Joint Venture [Line Items]      
Investment   $ 22,714,000 $ 9,977,000
S & I Ophthalmic, LLC      
Schedule Of Investments In Joint Venture [Line Items]      
Capital contributions $ 5,000,000 $ 5,000,000  
Membership interest 50.00%    
Number of board members designated by the Company | board_seat   2  
Number of board members not designated by the Company | board_seat   2  
S & I Ophthalmic, LLC | Investments In Affiliates      
Schedule Of Investments In Joint Venture [Line Items]      
Investment   $ 4,794,000 $ 6,379,000
S & I Ophthalmic, LLC | Investors      
Schedule Of Investments In Joint Venture [Line Items]      
Capital contributions $ 5,000,000 $ 5,000,000  
Membership interest 50.00%