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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues      
Product Revenues $ 84,518 $ 53,278.00 $ 0.00
Costs and expenses      
Product costs 78,155 50,777 0
Sales and marketing 297,687 799,009 860,365
Research and development 3,458,564 3,371,767 3,429,400
General and administrative 6,615,908 5,063,824 3,775,289
Total costs and expenses 10,450,314 9,285,377 8,065,054
Operating loss (10,365,796) (9,232,099) (8,065,054)
Other income (expense)      
Gain on disposal of equipment 13,233 941 2,861
Interest expense (22,257) (21,537) (402,554)
Other income (expense), net (7,239) (5,952) (5,914)
Total other income (expense) (16,263) (26,548) (405,607)
Net loss (10,382,059) (9,258,647) (8,470,661)
Other comprehensive income (loss):      
Foreign currency translation gain (loss) (360,302) 72,388 (59,840)
Total other comprehensive income (loss) (360,302) 72,388 (59,840)
Comprehensive loss (10,742,361) (9,186,259) (8,530,501)
Earnings Per Share [Abstract]      
Net loss (10,382,059) (9,258,647) (8,470,661)
Inducement to exercise common stock warrants (1,822,873) 0 0
Net loss available to common shareholders $ (12,204,932) $ (9,258,647) $ (8,470,661)
Basic and diluted net loss per share attributable to common shareholders (in dollars per share) $ (0.94) $ (1.06) $ (1.60)
Weighted average number of common shares -basic and diluted (in shares) 13,028,760 8,772,494 5,303,114