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Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities    
Net loss $ (46,005,641) $ (35,464,168)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 202,957 202,399
Loss on disposal of assets 2,174  
Non-cash lease expense 554,961 504,504
Stock-based compensation 4,767,205 5,274,173
Changes in assets and liabilities:    
Prepaid expenses and other current assets (971,063) 1,553,529
Accounts payable (699,508) (362,050)
Accrued expenses (2,144,716) (850,891)
Noncurrent accrued expenses 274,258 180,117
Lease liabilities (663,592) (593,511)
Net cash used in operating activities (44,682,965) (29,555,898)
Investing activities    
Purchases of property and equipment (12,496) (30,332)
Net cash used in investing activities (12,496) (30,332)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs 9,559,699 14,119,553
Proceeds from exercise of stock options 25,029 135,583
Net cash provided by financing activities 9,584,728 14,255,136
Net change in cash and cash equivalents (35,110,733) (15,331,094)
Cash and cash equivalents, beginning of period 137,035,017 158,201,441
Cash and cash equivalents, end of period $ 101,924,284 142,870,347
Non-cash investing and financing activities    
Property acquisition costs included in accounts payable   $ 10,688