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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (1,067,957) $ (936,757)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 59,150 104,820
Noncash stock-based compensation expense 60,708 96,800
Deferred rent (13,505) (11,108)
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (50,389) 141,438
Decrease (increase) in inventory 3,357 (5,230)
(Increase) in other current assets (21,421) (112,436)
(Increase) decrease in other assets (627) 1,500
Increase in accounts payable and accrued expenses 180,034 61,797
Increase (decrease) in deferred revenue 65,295 (157,787)
(Decrease) in other long-term liabilities (79,204)
Net cash used in operating activities (864,559) (816,963)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Capital expenditures (77,399) (9,534)
Collection of note receivable 9,968 13,267
Net cash (used in) provided by investing activities (67,431) 3,733
CASH FLOWS FROM FINANCING ACTIVITIES:    
Net proceeds from issuance of common stock from exercise of stock options 687,521 10,100
Net proceeds from issuance of common stock from exercise of warrants 14,300
Net cash provided by financing activities 687,521 24,400
Net decrease in cash (244,469) (788,830)
CASH, beginning of period 8,010,161 3,092,172
CASH, end of period $ 7,765,692 $ 2,303,342