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Income Taxes (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
Jan. 01, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards $ 44,100,000   $ 44,100,000    
Cumulative effect from change in accounting principal       $ 1,082,924  
Deferred tax asset, net of related valuation allowance 17,000,000   17,000,000    
Valuation allowance 15,900,000   15,900,000    
Deferred tax assets, net 0   0   $ 3,119,930
Additional valuation allowance from utilization of net operating loss carryforwards 3,500,000   3,500,000    
Income tax windfall benefit   $ 100,000      
State and Local Jurisdiction          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards $ 45,400,000   45,400,000    
Restricted Stock          
Operating Loss Carryforwards [Line Items]          
Share-based payment award, vested in period (in shares) 146,275        
Accounting Standards Update 2016-09          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, net       1,100,000  
Accounting Standards Update 2016-09 | Retained earnings          
Operating Loss Carryforwards [Line Items]          
Cumulative effect from change in accounting principal       $ 1,100,000  
Orphan Drug and Research and Development Tax Credit          
Operating Loss Carryforwards [Line Items]          
Valuation allowance     $ 1,000,000