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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenues, net $ 16,099,460 $ 16,777,713 $ 19,356,450
Cost of goods sold 2,737,652 2,636,943 4,185,708
Gross profit 13,361,808 14,140,770 15,170,742
Operating expenses:      
Sales, general, and administrative 115,988,954 57,703,370 51,348,414
Research and development 27,299,138 33,852,993 53,943,477
Depreciation and amortization 293,886 213,117 132,451
Total operating expenses 143,581,978 91,769,480 105,424,342
Operating loss (130,220,170) (77,628,710) (90,253,600)
Other (expense) income      
Miscellaneous income 2,280,844 695,631 367,317
Interest expense (4,677,834)    
Accreted interest   7,699 10,824
Total other (expense) income (2,396,990) 703,330 378,141
Loss before income taxes (132,617,160) (76,925,380) (89,875,459)
Provision for income taxes    
Net loss $ (132,617,160) $ (76,925,380) $ (89,875,459)
Loss per share, basic and diluted:      
Net loss per share, basic and diluted (in dollars per share) $ (0.59) $ (0.37) $ (0.46)
Weighted average number of common shares outstanding, basic and diluted (in shares) 225,026,300 205,523,288 196,088,196