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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues        
Product revenues $ 47,898 $ 53,278 $ 66,995 $ 53,278
Costs and expenses        
Product costs 47,287 50,777 63,519 50,777
Sales and marketing 76,381 202,910 158,028 411,198
Research and development 880,822 936,317 1,858,639 1,656,339
General and administrative 1,827,991 950,348 3,214,864 2,071,136
Total costs and expenses 2,832,481 2,140,352 5,295,050 4,189,450
Operating loss (2,784,583) (2,087,074) (5,228,055) (4,136,172)
Other income (expense)        
Gain on disposal of equipment 10,585 0 11,745 0
Interest expense (5,283) (5,253) (10,685) (10,533)
Other income (expense), net (1,868) (1,109) (3,941) (2,474)
Total other income (expense) 3,434 (6,362) (2,881) (13,007)
Net loss (2,781,149) (2,093,436) (5,230,936) (4,149,179)
Other comprehensive income (loss):        
Foreign currency translation income (loss) (85,811) 22,437 (197,929) 8,151
Total other comprehensive income (loss) (85,811) 22,437 (197,929) 8,151
Comprehensive loss $ (2,866,960) $ (2,070,999) $ (5,428,865) $ (4,141,028)
Basic and diluted net loss per share (in dollars per share) $ (0.22) $ (0.24) $ (0.42) $ (0.48)
Weighted average number of common shares - basic and diluted (in shares) 12,787,761 8,892,213 12,366,657 8,647,861