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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Consolidated Statements of Operations and Comprehensive Loss (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
Condensed Income Statements Captions [Line Items]                      
Revenue $ 3,620 $ 4,493 $ 4,879 $ 1,422 $ 1,098 $ 1,315 $ 1,097 $ 383 $ 14,414 $ 3,893 $ 1,092
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)
Income tax benefit (provision)                 (69) (842) (482)
Net loss $ (37,887) $ (37,631) $ (35,894) $ (35,241) $ (30,793) $ (25,494) $ (24,597) $ (21,096) $ (146,653) $ (101,980) $ (55,660)
Net loss per share attributable to ordinary shareholders—basic and diluted $ (1.29) $ (1.28) $ (1.23) $ (1.26) $ (1.11) $ (0.92) $ (0.91) $ (0.90) $ (5.06) $ (3.85) $ (2.44)
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member]                      
Condensed Income Statements Captions [Line Items]                      
Revenue                   $ 3,704 $ 1,485
Loss from operations                   (102,580) (55,327)
Income tax benefit (provision)                   (708) (616)
Net loss                   (102,035) $ (55,401)
Net loss per share attributable to ordinary shareholders—basic and diluted                     $ (2.43)
Effect of Change [Member] | ASC 606 [Member]                      
Condensed Income Statements Captions [Line Items]                      
Revenue                   189 $ (393)
Loss from operations                   189 (393)
Income tax benefit (provision)                   (134) 134
Net loss                   $ 55 $ (259)
Net loss per share attributable to ordinary shareholders—basic and diluted                     $ (0.01)