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Transactions with Olympus Corporation (Details) - USD ($)
 12 Months Ended
Apr. 30, 2015
May. 27, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 08, 2013
Acquisition of Olympus' Interest in the Joint Venture [Abstract]            
Remeasurement gain     $ 0 $ 0 $ 4,892,000  
Inputs used in valuation of acquired intangible assets [Abstract]            
Useful life     7 years      
Total purchase price $ 6,000,000          
Purchase price payment agreement term     2 years      
Amendment One to Joint Venture Termination Agreement [Member]            
Inputs used in valuation of acquired intangible assets [Abstract]            
Purchase price remaining balance $ 3,200,000          
Interest rate on the purchase price of remaining balance 6.00%          
Purchase price principal amount payable on May 8, 2015 $ 1,000,000          
Purchase price principal amount payable on September 30, 2015 500,000          
Purchase price principal amount payable in early January 2016 500,000          
Purchase price principal amount payable on March 31, 2016 500,000          
Purchase price principal amount and accrued interest payable on May 8, 2016 $ 700,000          
Acquired Olympus Ownership [Member]            
Acquisition of Olympus' Interest in the Joint Venture [Abstract]            
Equity interest acquired   50.00%        
Acquisition agreement date   May 27, 2013        
Remeasurement gain         $ 4,892,000  
Inputs used in valuation of acquired intangible assets [Abstract]            
Estimated fair value           $ 9,394,000
Fair value of purchase consideration   $ 4,928,000        
Unamortized discount resulting from fair value calculation of purchase obligations   $ 1,072,000        
Weighted average expected term for amortization of purchase obligation   1 year 9 months 18 days        
Extended purchase price amount in default prior to March 1, 2020     $ 16,000,000      
Fair value of the assets acquired and liabilities assumed at the date of acquisition [Abstract]            
Current assets           236,000
Property and equipment           260,000
Intangible assets           9,394,000
Total assets acquired           9,890,000
Accrued and other current liabilities           (33,000)
Total fair value of the Joint Venture           $ 9,857,000
Acquired Olympus Ownership [Member] | Minimum [Member]            
Inputs used in valuation of acquired intangible assets [Abstract]            
Discount rate used to value intangible assets   9.75%        
Acquired Olympus Ownership [Member] | Maximum [Member]            
Inputs used in valuation of acquired intangible assets [Abstract]            
Discount rate used to value intangible assets   12.75%        
Acquired Olympus Ownership [Member] | Developed Technology [Member]            
Inputs used in valuation of acquired intangible assets [Abstract]            
Useful life     7 years      
Estimated fair value     $ 9,394,000      
Fair value of the assets acquired and liabilities assumed at the date of acquisition [Abstract]            
Intangible assets     $ 9,394,000