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Condensed Statements of Cash Flows (Additional Information) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash and cash equivalents $ 3,808,774 $ 32,304,145
Restricted cash 0 50,000
Total 3,808,774 32,354,145
Supplemental disclosures of non-cash investing and financing activities:    
Property and equipment included in accounts payable 101,152 0
Property and equipment funded by capital lease 28,932 0
Leasehold improvements funded by landlord and related deferred rent included in accrued expenses 75,000 0
Registration statement costs included in accounts payable 13,182 0
Debt issuance costs netted against proceeds from sale of convertible promissory notes 0 844,170
Debt discount related to investor and agent warrants (Note 11) 0 1,063,715
Initial public offering costs included in accounts payable and accrued expenses 0 21,053
Underwriter's reimbursable offering costs netted against initial public offering proceeds $ 0 $ 275,000