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Unaudited Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Sales $ 12,448,436 $ 12,439,279 $ 36,713,996 $ 30,807,902
Cost of goods sold 6,444,544 6,862,992 19,300,120 17,007,228
Gross profit 6,003,892 5,576,287 17,413,876 13,800,674
Operating expenses:        
Research and development 2,094,774 1,432,581 5,510,861 4,096,670
Sales and marketing 1,809,037 1,453,391 5,229,188 4,078,250
General and administrative 1,899,449 1,459,993 6,174,869 3,304,790
Total operating expenses 5,803,260 4,345,965 16,914,918 11,479,710
Income from operations 200,632 1,230,322 498,958 2,320,964
Other expense (income):        
Interest income (98,689) (1,735) (189,855) (1,735)
Interest expense 22,762 41,735 80,239 141,505
Fair market value adjustment - warrants       (460,289)
Total other expense (income) (75,927) 40,000 (109,616) (320,519)
Income before income taxes 276,559 1,190,322 608,574 2,641,483
Provision for income taxes 42,206 7,278 59,251 8,078
Net income 234,353 1,183,044 549,323 2,633,405
Accretion of dividends on preferred convertible stock   (322,170)   (1,537,021)
Net income attributable to common stockholders $ 234,353 $ 860,874 $ 549,323 $ 1,096,384
Net income per share:        
Basic $ 0.02 $ 0.21 $ 0.06 $ 0.59
Diluted $ 0.02 $ 0.16 $ 0.05 $ 0.25
Weighted average shares used in calculating income per share:        
Basic 9,545,235 4,133,020 9,475,708 1,849,647
Diluted 10,169,559 6,689,332 10,238,987 3,103,784