XML 16 R6.htm IDEA: XBRL DOCUMENT v3.10.0.1
Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (21,336) $ (22,709)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 8,370 2,307
Depreciation and amortization expense 71 17
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (281) 290
Accounts payable (898) 638
Accrued expense (2,514) 3,085
Accrued interest, net of interest received on maturity of investments (2,654)  
Net cash used in operating activities (19,242) (16,372)
Cash flows from investing activities:    
Purchases of marketable securities (524,935) (34,910)
Sales and maturities of marketable securities 119,885 6,944
Purchases of property and equipment, net of disposals (14) (125)
Net cash used in investing activities (405,064) (28,091)
Cash flows from financing activities:    
Proceeds from issuance of stock, net of transaction costs 311,825 38,278
Proceeds from exercise of common stock options 1,900  
Net cash provided by financing activities 313,725 38,278
Net decrease in cash and cash equivalents (110,581) (6,185)
Cash and cash equivalents at beginning of period 148,627 19,145
Cash and cash equivalents at end of period $ 38,046 $ 12,960