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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONDENSED STATEMENTS OF OPERATIONS        
Revenue $ 9,225,596 $ 7,376,785 $ 17,663,189 $ 14,484,936
Cost of revenue 1,858,288 1,710,890 3,906,115 3,402,425
Gross profit 7,367,308 5,665,895 13,757,074 11,082,511
Operating expenses:        
General and administrative 2,460,372 2,078,356 4,873,068 4,381,888
Sales and marketing 2,199,823 1,516,044 4,310,475 3,161,980
Research and development 331,310 395,988 683,883 775,814
Total operating expenses 4,991,505 3,990,388 9,867,426 8,319,682
Income from operations 2,375,803 1,675,507 3,889,648 2,762,829
Other income, net 78,025 27,838 170,599 67,910
Income before provision for income taxes 2,453,828 1,703,345 4,060,247 2,830,739
Provision for income tax expense 364,987 348,377 125,841 634,575
Net income $ 2,088,841 $ 1,354,968 $ 3,934,406 $ 2,196,164
Net income per share:        
Basic (in dollars per share) $ 0.19 $ 0.13 $ 0.35 $ 0.21
Diluted (in dollars per share) $ 0.17 $ 0.11 $ 0.32 $ 0.18
Weighted average shares outstanding:        
Basic (in shares) 11,163,506 10,651,619 11,096,942 10,630,123
Diluted (in shares) 12,226,660 12,011,475 12,227,949 11,953,486