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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)

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 + Details
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