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CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
10 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Operating activities    
Net loss $ (8,010,860) $ (29,141,630)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 11,997 49,881
Stock-based compensation expense 1,462,061 6,597,359
Amortization of premium on investments 0 9,523
Other non-cash items 55,221 4,123
Changes in operating assets and liabilities:    
Restricted cash (126,808) (27)
Prepaid expenses and other current assets (370,396) (538,178)
Other assets (50,000) 100,103
Accounts payable 254,253 621,393
Accrued expenses and other current liabilities 220,375 1,570,216
Deferred rent 57,849 (18,881)
Other long term liabilities 15,442 0
Net cash used in operating activities (6,480,866) (20,746,118)
Investing activities    
Purchases of marketable securities 0 (39,397,769)
Proceeds from maturities and sales of marketable securities 0 12,398,295
Purchases of property and equipment (76,141) (265,617)
Net cash used in investing activities (76,141) (27,265,091)
Financing activities    
Proceeds from initial public offering, net of offering costs 0 80,435,430
Proceeds from sale of restricted common stock to founders 2,321 0
Proceeds from exercise of common stock 8,138 408,321
Deferred IPO issuance costs (575,245) 0
Net cash provided by financing activities 40,411,160 80,843,751
Net increase in cash and cash equivalents 33,854,153 32,832,542
Cash and cash equivalents at beginning of period   33,854,153
Cash and cash equivalents at end of period 33,854,153 66,686,695
Supplemental cash flow information    
Issuance of Series A convertible preferred stock in satisfaction of accounts payable 55,221 0
Deferred IPO issuance costs in accounts payable and accrued expenses 499,549 0
Property and equipment purchases in accrued expenses 21,000 106,680
IPO issuance costs paid in cash through December 31, 2014 0 575,245
Series A Preferred Stock    
Financing activities    
Proceeds from issuance of convertible preferred stock, net of issuance costs 15,581,811 0
Series B Preferred Stock    
Financing activities    
Proceeds from issuance of convertible preferred stock, net of issuance costs $ 25,394,135 $ 0