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Severance Accrual (Details) - Chief Executive Officer [Member] - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Net charge to general and administrative expense relating to resignation of chief executive officer (CEO) $ 265,000  
Severance Costs 350,000  
Forfeiture of stock options, restricted stock units 85,000  
Severance Accrual $ 0 $ 350,000