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Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (5,655,514) $ (4,527,542)
Adjustments to reconcile net loss to net cash used for operations:    
Depreciation 152,514 76,163
Stock-based compensation 913,040 561,097
Non-cash interest expense 0 451,664
Non-cash interest income adjustment (17,693) 0
Changes in operating assets and liabilities:    
Prepaid assets and deposits (136,896) (269,438)
Accounts payable (8,561) (300,792)
Accrued expenses 196,059 170,828
Net cash used for operating activities (4,557,051) (3,838,020)
Cash flows from investing activities:    
Purchases of investments (3,235,000) (245,000)
Proceeds from sale of investments 9,145,000 0
Purchases of property and equipment (482,426) (203,496)
Proceeds from sale of property and equipment 1,000 0
Net cash provided by (used for) investing activities 5,428,574 (448,496)
Cash flows from financing activities:    
Proceeds from exercise of common stock warrants 183,759 0
Proceeds from employee stock purchases 79,797 0
Proceeds from sale of convertible promissory notes 0 7,493,330
Proceeds from initial public offering of common stock 0 24,109,650
Payments for registration statement costs (14,197) 0
Payments for capital leases (1,897) 0
Payments for debt issuance costs 0 (40,961)
Payments for initial public offering costs 0 (827,706)
Net cash provided by financing activities 247,462 30,734,313
Net change in cash, cash equivalents, and restricted cash 1,118,985 26,447,797
Cash, cash equivalents, and restricted cash:    
Beginning of period 2,689,789 5,906,348
End of period $ 3,808,774 $ 32,354,145