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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Sales $ 49,521,171 $ 43,433,867 $ 27,793,073
Cost of goods sold 26,218,965 24,156,792 16,148,163
Gross profit 23,302,206 19,277,075 11,644,910
Operating expenses:      
Research and development 7,319,575 5,622,132 4,257,400
Sales and marketing 7,012,829 5,670,625 4,035,591
General and administrative 8,000,602 4,532,151 3,453,288
IPO costs     229,332
Total operating expenses 22,333,006 15,824,908 11,975,611
Income (loss) from operations 969,200 3,452,167 (330,701)
Other (income) expense:      
Interest income (296,451) (7,803)  
Interest expense 98,711 178,371 39,489
Fair market value adjustment - warrants   (460,289) (85,325)
Exercise and expiration of warrants     (15,145)
Total other (income) expense (197,740) (289,721) (60,981)
Income (loss) before income taxes 1,166,940 3,741,888 (269,720)
Provision for income taxes 25,685 8,181 622
Net income (loss) 1,141,255 3,733,707 (270,342)
Accretion of dividends on preferred convertible stock   (1,537,021) (2,444,954)
Net income (loss) attributable to common stockholders $ 1,141,255 $ 2,196,686 $ (2,715,296)
Net income (loss) per share:      
Basic $ 0.12 $ 0.65 $ (4.17)
Diluted $ 0.11 $ 0.40 $ (4.30)
Weighted average shares used in calculating income (loss) per share      
Basic 9,485,271 3,373,316 651,593
Diluted 10,361,373 4,667,503 651,593