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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (6,205,486) $ (8,717,142)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 182,036 556,261
Amortization of premium and discount on marketable securities 55,685 45,439
Changes in operating assets and liabilities:    
Prepaid expenses, deposits and other assets (582,664) (118,025)
Accounts payable, accrued expenses and other liabilities (952,359) (412,662)
Net cash used in operating activities (7,614,158) (8,737,007)
Cash flows from investing activities:    
Purchases of marketable securities 0 (31,615,825)
Maturities of marketable securities 12,500,000 9,000,000
Net cash provided by (used in) investing activities 12,500,000 (22,615,825)
Cash flows from financing activities:    
Proceeds from the sale of series C preferred stock to related parties 0 5,000
Net cash provided by financing activities 0 5,000
Net increase (decrease) in cash and cash equivalents 4,885,842 (31,347,832)
Cash and cash equivalents at beginning of period 10,113,706 37,313,558
Cash and cash equivalents at end of period 14,999,548 5,965,726
Supplemental disclosure of non-cash investing and financing activities:    
Unrealized gain (loss) on marketable securities $ 0 $ (86,583)