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Unaudited Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Sales $ 13,013,143 $ 9,856,317 $ 24,265,560 $ 18,368,623
Cost of goods sold 6,891,619 5,309,556 12,855,577 10,144,237
Gross profit 6,121,524 4,546,761 11,409,983 8,224,386
Operating expenses:        
Research and development 1,819,288 1,342,403 3,416,087 2,664,090
Sales and marketing 1,792,010 1,383,755 3,420,151 2,624,859
General and administrative 2,637,380 846,555 4,275,419 1,844,795
Total operating expenses 6,248,678 3,572,713 11,111,657 7,133,744
Income (loss) from operations (127,154) 974,048 298,326 1,090,642
Other expense (income):        
Interest income (53,965)   (91,166)  
Interest expense 26,713 47,294 57,477 99,770
Fair market value adjustment - warrants   (381,455)   (460,289)
Total other income (27,252) (334,161) (33,689) (360,519)
Income (loss) before income taxes (99,902) 1,308,209 332,015 1,451,161
Provision (benefit) for income taxes (29,781) (3,000) 17,045 800
Net income (loss) (70,121) 1,311,209 314,970 1,450,361
Accretion of dividends on preferred convertible stock   (610,781)   (1,214,850)
Net income (loss) attributable to common stockholders $ (70,121) $ 700,428 $ 314,970 $ 235,511
Net income (loss) per share:        
Basic $ (0.01) $ 0.97 $ 0.03 $ 0.34
Diluted $ (0.01) $ 0.15 $ 0.03 $ (0.32)
Weighted average shares used in calculating income (loss) per share:        
Basic 9,520,285 724,979 9,440,368 695,415
Diluted 9,520,285 4,479,505 10,120,998 695,415