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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net loss $ (6,079,142) $ (8,251,037)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 54,727 12,393
Stock-based compensation expense 644,436 681,449
Common stock issued for advisory services 25,000
Warrant related expense, change in fair value, and other financing expenses 2,627,896
Deferred income taxes (267,932)
Non-cash interest expense 85,309
Changes in operating assets and liabilities:    
Prepaid expenses, deposits and other assets 185,487 (68,189)
Accounts payable, accrued expenses and other liabilities (391,861) (1,249,735)
Net cash used in operating activities (5,829,285) (6,161,914)
Cash flows used in investing activities:    
Purchases of property and equipment (64,002)
Purchase of certificate of deposit (10,000,000)
Net cash used in investing activities (10,064,002)
Cash flows provided by financing activities:    
Payment of debt principal (550,000)
Proceeds from the sale of common stock 10,846,062
Proceeds from the sale of Series A convertible preferred stock, net 22,129,774
Payment of offering costs (428,542) (43,311)
Net cash provided by financing activities 9,867,520 22,086,463
Net increase in cash and cash equivalents 4,038,235 5,860,547
Cash and cash equivalents at beginning of period 8,896,468 1,552,852
Cash and cash equivalents at end of period 12,934,703 7,413,399
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 stock holders 1,148,307
Purchases of property and equipment in accounts payable and accrued expenses (348,286)
Offering costs in accounts payable and accrued expenses (50,103)
Series A cumulative preferred dividends (85,993)  
Conversion of accrued dividends related to Series A convertible preferred stock 70,890
Series A Preferred Stock [Member]    
Supplemental disclosure of non-cash investing and financing activities:    
Series A cumulative preferred dividends $ (85,993) $ (546,305)