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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities    
Net loss $ (10,793,993) $ (6,564,956)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 3,894 1,022
Stock-based compensation 1,041,656 2,432,045
Prepaid forward sale to supplier 416,000
Changes in operating assets and liabilities:    
Prepaid expenses (57,092) (251,251)
Accounts payable 2,131,022 (246,644)
Accrued expenses 293,793 (86,087)
Other liabilities 12,841 (2,698)
Net cash used in operating activities (7,367,879) (4,302,569)
Cash flows from investing activities    
Purchases of property and equipment (8,063) (10,100)
Net cash used in investing activities (8,063) (10,100)
Cash flows from financing activities    
Proceeds from exercise of options on common stock 8,504 4,537
Proceeds from issuance of shares upon closing of initial public offering 20,000,000
Commissions and issuance costs of initial public offering (2,194,375)
Net cash provided by financing activities 8,504 17,810,162
Net (decrease) increase in cash and cash equivalents (7,367,438) 13,497,493
Cash and cash equivalents at beginning of period 15,819,566 2,747,248
Cash and cash equivalents at end of period 8,452,128 16,244,741
Supplemental disclosure of cash flow information    
Cash paid for interest
Cash paid for taxes 72,112
Supplemental disclosure of noncash financing activities    
Accrual of commissions and issuance costs of initial public offering 213,561
Deferred offering costs reclassified to additional paid-in capital 665,603
Conversion of all outstanding preferred stock into common stock 8,888
Conversion of all outstanding preferred stock subject to redemption into common stock 16,594,464
Common stock subject to repurchase 180
Cumulative preferred stock dividends 327,569
Accretion of discount on Series C preferred stock $ 63,283