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Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating activities    
Net loss $ (23,481,241) $ (3,887,795)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 139,749 142,417
Loss on disposal of property and equipment   8,001
Stock-based compensation expense 2,238,647 1,678,668
Changes in assets and liabilities    
Prepaid expenses and other current assets (797,906) 198,015
Prepaid research and development expenses (63,000)  
Deposits (52,320)  
Accounts payable 682,504 (240,935)
Accrued expenses (3,122,258) 727,701
Deferred rent 679,177 89,514
Net cash used in operating activities (23,776,648) (1,284,414)
Investing activities    
Purchases of property and equipment (265,635) (265,367)
Net cash used in investing activities (265,635) (265,367)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs 22,453,785  
Proceeds from exercise of stock options 68,488 110,697
Net cash provided by financing activities 22,522,273 110,697
Net change in cash and cash equivalents (1,520,010) (1,439,084)
Cash and cash equivalents, beginning of period 46,802,560 55,198,923
Cash and cash equivalents, end of period 45,282,550 $ 53,759,839
Supplemental disclosure of non-cash investing activities:    
Property asset acquisition included in accounts payable and accrued expenses $ 29,329