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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash Flows from Operating Activities:    
Net loss $ (6,485,644) $ (5,318,925)
Reconciliation of net loss to net cash used in operating activities:    
Depreciation and amortization 35,265 10,514
Changes in fair value of warrant liabilities (31,000) 9,000
Stock-based compensation 1,344,592 1,525,976
Amortization on right-of-use assets 47,361 44,211
Changes in operating assets and liabilities:    
Prepaid expenses and deposits (189,650) (74,716)
Interest receivable 31,584 (4,023)
Accounts payable and accrued expenses 1,197,613 (27,628)
Lease liability (49,187) (44,575)
Net cash used in operating activities (4,099,066) (3,880,166)
Cash Flows from Investing Activities:    
Purchase of property and equipment (99,821) (223,126)
Net cash used in investing activities (99,821) (223,126)
Cash Flows from Financing Activities:    
Proceeds from exercise of stock options   57,744
Proceeds from exercise of warrants 550,000 5,379
Net cash provided by financing activities 550,000 63,123
Net decrease in cash (3,648,887) (4,040,169)
Cash and cash equivalents at beginning of the period 43,903,949 61,746,748
Cash and cash equivalents at end of the period 40,255,062 57,706,579
Supplemental schedule of non-cash financing activities:    
Issuance of common stock as commitment fee for future financing $ 345 $ 0