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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (4,643,919) $ (2,558,815)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 24,447 27,020
Stock-based compensation expense 181,280 191,380
Change in deferred income taxes (362,380)
Changes in operating assets and liabilities:    
Prepaid expenses, deposits and other assets (417,677) (346,030)
Accounts payable, accrued expenses and other liabilities (320,501) (455,489)
Net cash used in operating activities (5,176,370) (3,504,314)
Cash flows provided by financing activities:    
Proceeds from the sale of common stock, net of issuance costs 31,094,302
Proceeds received from the exercise of common stock warrants 2,201,450 393,425
Payment of financing costs that were previously classified in accounts payable (238,232)
Net cash provided by financing activities 33,295,752 155,193
Net increase (decrease) in cash and cash equivalents 28,119,382 (3,349,121)
Cash and cash equivalents at beginning of period 18,515,595 14,177,349
Cash and cash equivalents at end of period 46,634,977 10,828,228
Supplemental disclosure of non-cash financing activities:    
Offering costs in accounts payable and accrued expenses $ 258,627