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Commitments (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Commitment amount $ 450,000    
Operating lease:      
Lease expiration date Mar. 31, 2025    
2016 $ 174,000    
2017 180,000    
2018 186,000    
2019 191,000    
2020 197,000    
Thereafter 905,000    
Rent expense $ 181,000 $ 173,000 $ 187,000