Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies (Details Textual)

v3.19.1
Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Description of Business and Summary of Significant Accounting Policies (Textual)      
Federal corporate tax rate 21.00% 34.00% 34.00%
Net loss $ (23,653,963) $ (26,601,235) $ (24,321,724)
Net cash used in operations (20,571,056) (21,553,346) (20,789,237)
Cash and cash equivalents 13,673,308 17,399,636 $ 20,519,294
Accumulated deficit $ (186,857,238) $ (163,153,037)  
Minimum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Federal corporate tax rate   35.00%  
Maximum [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Federal corporate tax rate   21.00%  
Furniture and Fixtures [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Estimated useful lives, description Seven years    
Property and equipment depreciation method Straight-line basis    
Machinery and Equipment [Member]      
Description of Business and Summary of Significant Accounting Policies (Textual)      
Estimated useful lives, description Three to five years    
Property and equipment depreciation method Straight-line basis