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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
License and collaboration revenue - related party $ 8,781 $ 0 $ 8,781 $ 0
Operating expenses:        
Research and development 11,168 5,561 34,457 16,882
General and administrative 2,593 1,577 8,708 4,387
Total operating expenses 13,761 7,138 43,165 21,269
Loss from operations (4,980) (7,138) (34,384) (21,269)
Interest income 155 54 479 93
Change in fair value of redeemable convertible preferred stock tranche and warrant liabilities 0 0 0 (4,719)
Other expense 0 0 0 (34)
Net loss (4,825) (7,084) (33,905) (25,929)
Net loss attributable to common stockholders $ (4,825) $ (7,377) $ (33,905) $ (26,487)
Net loss per share attributable to common stockholders, basic and diluted (in usd per share) $ (0.29) $ (0.87) $ (2.01) $ (8.62)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted 16,911,575 8,483,189 16,851,672 3,071,456