Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (2,686,128)	$ (2,413,859)	$ (4,238,410)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	181,047	175,643	188,501
Warrant market adjustment	278,044
Share based compensation	69,309	76,299	67,531
Loss on sale of fixed asset			1,775
Bad debts	43,350	56,415	480,563
Change in assets and liabilities:
Royalties receivable	(77,565)	463,290	(283,035)
Prepaid expenses and other current assets	(23,032)	227,195	(123,427)
Accounts payable and accrued expenses	94,169	(56,347)	(98,941)
Deferred revenue	49,746	824
Net cash used in operating activities	(2,071,060)	(1,470,540)	(4,005,443)
Cash flows from investing activities:
Purchases of fixed assets	(11,663)	(6,549)	(11,715)
Proceeds from sale of fixed asset			6,000
Proceeds from sale of investment		1,523,333	(9,549)
Net cash (used in) provided by investing activities	(11,663)	1,516,784	(15,264)
Cash flows from financing activities:
Net proceeds from issuances of common stock and warrants and exercise of options and warrants	3,314,292
Net cash (used in) provided by financing activities	3,314,292
Net increase (decrease) in cash and cash equivalents	1,231,569	46,244	(4,020,707)
Cash and cash equivalents at beginning of year	1,737,847	1,691,603	5,712,310
Cash and cash equivalents at end of year	$ 2,969,416	$ 1,737,847	$ 1,691,603