Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details Textual)

v3.7.0.1
Stock-Based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 20, 2007
Mar. 31, 2017
Mar. 31, 2016
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   $ 5,600,000          
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   $ 1,100,000 $ 1,100,000        
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   543,927 150,000        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value   $ 308,000 $ 153,000        
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          
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   10,745,591         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       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       8,000,000 6,000,000 3,000,000