Statements of Stockholders' Equity (Deficit) - USD ($)	Common Stock	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Beginning Balance at Dec. 31, 2017	$ 8,006	$ 170,803,783	$ (204,988,674)	$ (34,176,885)
Beginning Balance, shares at Dec. 31, 2017	80,060,345
Issuance of common stock for services (unaudited)	$ 2	59,998	0	60,000
Issuance of common stock for services (unaudited) (Shares)	17,241
Options exercised, net (unaudited)	$ 25	400,734	0	400,759
Options exercised, net (unaudited) (Shares)	249,666
Warrants exercised, net (unaudited)	$ 568	2,699,651	0	2,700,219
Warrants exercised, net (unaudited) (Shares)	5,684,499
Stock-based compensation, net (unaudited)	$ 0	119,623	0	119,623
Net (loss) income	0	0	22,039,472	22,039,472
Ending Balance at Mar. 31, 2018	$ 8,601	174,083,789	(182,949,202)	(8,856,812)
Ending Balance, shares at Mar. 31, 2018	86,011,751
Beginning Balance at Dec. 31, 2017	$ 8,006	170,803,783	(204,988,674)	(34,176,885)
Beginning Balance, shares at Dec. 31, 2017	80,060,345
Ending Balance at Dec. 31, 2018	$ 11,094	176,227,510	(171,002,508)	5,236,096
Ending Balance, shares at Dec. 31, 2018	110,941,516
Issuance of common stock for services (unaudited)	$ 14	59,986	0	60,000
Issuance of common stock for services (unaudited) (Shares)	136,362
Warrants exercised, net (unaudited)	$ 5	19,995	0	20,000
Warrants exercised, net (unaudited) (Shares)	50,000
Stock-based compensation, net (unaudited)	$ 0	27,555	0	27,555
Net (loss) income	0	0	(5,811,634)	(5,811,634)
Ending Balance at Mar. 31, 2019	$ 11,113	$ 176,335,046	$ (176,814,142)	$ (467,983)
Ending Balance, shares at Mar. 31, 2019	111,127,878