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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue            
Total revenue $ 1,009,543 $ 788,901 $ 2,029,720 $ 1,635,127 $ 2,946,307 $ 3,211,007
Operating expenses            
Research and development 1,153,584 1,304,388 2,929,966 2,534,817 5,677,243 6,883,293
General and administrative 1,592,845 1,831,063 3,340,430 3,621,585 7,069,315 6,692,659
Sales and marketing 393,567 426,297 765,800 756,070 1,531,556 2,767,670
Impairment of right-of-use asset 0 0 520,759 0    
Total operating expenses 3,590,470 4,044,813 8,372,613 7,906,922 16,126,549 18,476,798
Operating loss (2,580,927) (3,255,912) (6,342,893) (6,271,795) (13,180,242) (15,265,791)
Other (expense) income            
Interest and other income (expense) 15,166 5 (9,256) 5,303 5,384 (87,255)
Interest expense (37,129) (54,533) (93,573) (112,379) (191,195) (233,505)
Foreign currency transaction gains (losses) 9,879 (21,762) (472) (9,581) (10,431) 23,179
Change in fair value of derivative financial instruments 0 (11) 67 8,155 8,386 144,064
Total other expense (12,084) (76,301) (103,234) (108,502) (187,856) (153,517)
Loss before income taxes (2,593,011) (3,332,213) (6,446,127) (6,380,297) (13,368,098) (15,419,308)
Provision for income taxes 0 0 0 0 0 0
Net loss (2,593,011) (3,332,213) (6,446,127) (6,380,297) $ (13,368,098) $ (15,419,308)
Net loss available to common stockholders $ (2,593,011) $ (3,332,213) $ (6,446,127) $ (6,380,297)    
Net loss per common share - basic and diluted $ (0.15) $ (0.57) $ (0.48) $ (1.29) $ (2.22) $ (9.80)
Weighted average shares outstanding - basic and diluted 17,645,720 5,826,947 13,518,648 4,950,517 6,009,065 1,573,769
Net loss $ (2,593,011) $ (3,332,213) $ (6,446,127) $ (6,380,297) $ (13,368,098) $ (15,419,308)
Other comprehensive (loss) gain - foreign currency translations (4,950) 18,113 (2,124) 5,534 12,807 (32,076)
Comprehensive loss (2,597,961) (3,314,100) (6,448,251) (6,374,763) (13,355,291) (15,451,384)
Service [Member]            
Operating expenses            
Cost of products and services 251,981 179,402 396,463 347,955 625,516 520,338
Collaborations Revenue [Member]            
Revenue            
Total revenue 500,000 155,276 1,000,000 359,316 516,016 397,178
Product [Member]            
Revenue            
Total revenue 504,293 632,525 1,024,470 1,266,021 2,395,626 2,771,869
Operating expenses            
Cost of products and services 198,493 303,663 419,195 646,495 1,222,919 1,612,838
Laboratory Service Revenue [Member]            
Revenue            
Total revenue $ 5,250 $ 1,100 $ 5,250 $ 9,790 $ 34,665 $ 41,960