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Liquidity (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 16, 2017
Mar. 15, 2017
Net loss $ (4,199,000) $ (24,721,000) $ (788,000)    
Prosperity Bank [Member]          
Credit facility current borrowing capacity $ 3,000,000        
Subsequent Event [Member] | Prosperity Bank [Member]          
Credit facility current borrowing capacity       $ 1,250,000 $ 3,000,000
Current funds drawn       $ 0