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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash Flows from Operating Activities:    
Net loss $ (12,827,343) $ (10,889,316)
Reconciliation of net loss to net cash used in operating activities:    
Depreciation and amortization 124,627 39,811
Changes in fair value of warrant liabilities (31,000) 16,000
Stock-based compensation 2,705,365 2,889,243
Amortization on right-of-use assets 96,973 89,178
Changes in operating assets and liabilities:    
Prepaid expenses and deposits (1,106,072) (349,750)
Interest receivable 52,749 10,023
Accounts payable and accrued expenses 2,770,341 225,135
Lease liability (187,068) (89,907)
Net cash used in operating activities (8,401,428) (8,059,583)
Cash Flows from Investing Activities:    
Purchase of property and equipment (1,299,193) (305,382)
Purchase of construction in progress (2,629,141) 0
Net cash used in investing activities (3,928,334) (305,382)
Cash Flows from Financing Activities:    
Proceeds from exercise of stock options 0 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 (11,779,762) (8,301,842)
Cash and cash equivalents at beginning of the period 43,903,949 61,746,748
Cash and cash equivalents at end of the period 32,124,187 53,444,906
Supplemental schedule of non-cash financing activities:    
Issuance of common stock as commitment fee for future financing 345 0
Recognition of right-of-use assets and lease liability from new operating lease agreements $ 9,184,027 $ 0