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Unaudited Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities    
Net loss $ (43,165,594) $ (34,366,718)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 211,391 206,794
Loss on disposal of property and equipment   168
Non cash lease expense 459,599  
Stock-based compensation expense 4,488,985 3,437,341
Changes in assets and liabilities    
Prepaid expenses and other current assets (1,642,917) 689,698
Prepaid research and development expenses   (1,510,607)
Accounts payable (1,256,031) (1,987,696)
Accrued expenses and bonuses 2,244,062 232,534
Operating lease liabilities (530,818) (52,644)
Net cash used in operating activities (39,191,323) (33,351,130)
Investing activities    
Purchases of property and equipment (132,571) (68,614)
Net cash used in investing activities (132,571) (68,614)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs   128,425,080
Proceeds from exercise of stock options and warrants 293,091 898,560
Net cash provided by financing activities 293,091 129,323,640
Net change in cash and cash equivalents (39,030,803) 95,903,896
Cash and cash equivalents, beginning of period 209,917,595 123,924,738
Cash and cash equivalents, end of period $ 170,886,792 $ 219,828,634