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Selected Quarterly Financial Information (Unaudited) - Schedule of Selected Quarterly Results from Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]                      
Revenue $ 3,620 $ 4,493 $ 4,879 $ 1,422 $ 1,098 $ 1,315 $ 1,097 $ 383 $ 14,414 $ 3,893 $ 1,092
Operating expenses 52,563 42,725 41,452 37,197 32,256 27,668 25,770 20,590 173,937 106,284 56,812
Loss from operations (48,943) (38,232) (36,573) (35,775) (31,158) (26,353) (24,673) (20,207) (159,523) (102,391) (55,720)
Net loss $ (37,887) $ (37,631) $ (35,894) $ (35,241) $ (30,793) $ (25,494) $ (24,597) $ (21,096) $ (146,653) $ (101,980) $ (55,660)
Basic and diluted net loss per ordinary share $ (1.29) $ (1.28) $ (1.23) $ (1.26) $ (1.11) $ (0.92) $ (0.91) $ (0.90) $ (5.06) $ (3.85) $ (2.44)