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Stock-Based Compensation (Allocation of Stock-Based Compensation Expense) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock-based compensation expense $ 334,000 $ 149,000 $ 1,698,000 $ 253,000
Research and development expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock-based compensation expense 37,000 29,000 89,000 88,000
General and administrative expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock-based compensation expense $ 297,000 $ 120,000 $ 1,609,000 $ 165,000