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Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 20, 2007
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 07, 2017
Aug. 25, 2016
May 15, 2015
Oct. 22, 2013
Nov. 02, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 3,700,000   $ 3,700,000            
Employees And Consultants [Member] | General and Administrative Expenses and Research and Development Expense [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Allocated Share-based Compensation Expense   $ 900,000 $ 946,000 $ 2,906,000 $ 2,906,000          
Employee [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       543,927 560,000          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value       $ 308,000 $ 962,000          
2007 Stock Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,500,000 743,924   743,924            
2007 Stock Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 250,000                  
2010 Stock Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   10,475,091   10,475,091           3,000,000
2010 Stock Plan [Member] | Maximum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance           17,500,000 14,000,000 8,000,000 6,000,000  
2010 Stock Plan [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common Stock, Capital Shares Reserved for Future Issuance           14,000,000 8,000,000 6,000,000 3,000,000