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Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 07, 2017
May 15, 2015
Aug. 25, 2016
Oct. 22, 2013
Mar. 20, 2007
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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           $ 1,600,000   $ 1,600,000    
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           $ 557,000 $ 870,000 $ 1,200,000 $ 2,000,000  
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  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value                 $ 308,000  
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         2,500,000 712,258   712,258    
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           11,456,257   11,456,257   3,000,000
2010 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 17,500,000 8,000,000 14,000,000 6,000,000            
2010 Stock Plan [Member] | Minimum [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 8,000,000 6,000,000 8,000,000 3,000,000