CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Operating expenses:      
Research and development $ 38 $ 29,356 $ 11,352
General and administrative 123 7,620 2,418
Total operating expenses 161 36,976 13,770
Loss from operations (161) (36,976) (13,770)
Change in fair value of convertible preferred stock liability     (17,600)
Interest income and other expense, net   601 35
Net loss $ (161) $ (36,375) $ (31,335)
Net loss per share, basic and diluted (in dollars per share) $ (0.95) $ (2.36) $ (83.86)
Shares used to compute net loss per share, basic and diluted (in shares) 170,278 15,422,041 373,643
Other comprehensive income (loss):      
Unrealized gain (loss) on marketable securities   $ 6 $ (45)
Comprehensive loss $ (161) $ (36,369) $ (31,380)