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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues    
Product revenues $ 97,885 $ 19,097
Costs and expenses    
Product costs 81,613 16,232
Sales and marketing 71,991 81,647
Research and development 663,481 977,817
General and administrative 2,036,493 1,386,873
Total costs and expenses 2,853,578 2,462,569
Operating loss (2,755,693) (2,443,472)
Other income (expense)    
Gain on disposal of equipment 0 1,160
Interest expense (13,338) (5,402)
Other income (expense), net 5,100 (2,073)
Total other income (expense) (8,238) (6,315)
Net loss (2,763,931) (2,449,787)
Other comprehensive income (loss):    
Foreign currency translation income (loss) 87,551 (112,118)
Total other comprehensive income (loss) 87,551 (112,118)
Comprehensive loss $ (2,676,380) $ (2,561,905)
Basic and diluted net loss per share (in dollars per share) $ (0.18) $ (0.21)
Weighted average number of common shares - basic and diluted (in shares) 15,687,681 11,940,874