Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net loss	$ (5,243,207)	$ (6,079,142)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	52,662	54,727
Stock-based compensation expense	240,284	644,436
Common stock issued for advisory services		25,000
Change in deferred income taxes	(259,256)	(267,932)
Changes in operating assets and liabilities:
Prepaid expenses, deposits and other assets	(106,390)	185,487
Accounts payable, accrued expenses and other liabilities	48,320	(391,861)
Net cash used in operating activities	(5,267,587)	(5,829,285)
Cash flows provided by financing activities:
Repayment of convertible debt principal		(550,000)
Proceeds from the sale of common stock	5,731,779	10,846,062
Payment of offering costs	(82,623)	(428,542)
Net cash provided by financing activities	5,649,156	9,867,520
Net increase in cash and cash equivalents	381,569	4,038,235
Cash and cash equivalents at beginning of period	7,991,172	8,896,468
Cash and cash equivalents at end of period	8,372,741	12,934,703
Supplemental disclosure of cash flow information
Cash paid for interest		40,142
Supplemental disclosure of non-cash investing and financing activities:
Reclassification of accrued dividends related to the issuance of common stock to Series A convertible preferred stockholders		1,148,307
Offering costs in accounts payable	80,206
Series A cumulative preferred dividends		85,993
Operating lease right of use asset and current and noncurrent liability	$ 334,205