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Stock Incentive Plans and Stock-Based Compensation - Additional Information (Detail) | 6 Months Ended | 12 Months Ended |  |  |
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Nov. 30, 2021 $ / shares shares | May 31, 2021 $ / shares shares | Nov. 30, 2020 $ / shares shares | May 31, 2020 $ / shares shares | Nov. 30, 2019 $ / shares shares | May 31, 2019 $ / shares shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2021 £ / shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 £ / shares | Mar. 31, 2015 £ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value | £ / shares |  |  |  |  |  |  |  |  |  | £ 0.50 |  | £ 0.50 | £ 0.50
Weighted average fair value of the stock options granted | $ / shares |  |  |  |  |  |  | $ 5.12 | $ 14.43 | $ 17.07 |  |  |  |
Grant date fair value of options vested |  |  |  |  |  |  | $ 21,100,000 | $ 22,500,000 | $ 14,500,000 |  |  |  |
Proceeds from the exercise of options |  |  |  |  |  |  | 2,921,000 | 5,158,000 | 24,478,000 |  |  |  |
Intrinsic value of options exercised |  |  |  |  |  |  | $ 4,900,000 | 9,000,000.0 | 90,500,000 |  |  |  |
Unrecognized stock-based compensation expense related to unvested stock option |  |  |  |  |  |  |  |  |  |  | $ 30,700,000 |  |
Unrecognized stock-based compensation expense related to unvested stock option, recognition period |  |  |  |  |  |  | 2 years 2 months 12 days |  |  |  |  |  |
Compensation expense related to stock option |  |  |  |  |  |  | $ 23,000,000.0 | 22,400,000 | 16,300,000 |  |  |  |
Compensation expense in relation to restricted stock units |  |  |  |  |  |  | $ 13,900,000 | $ 23,400,000 | $ 14,600,000 |  |  |  |
Ordinary shares, reserved and available for issuance | shares |  |  |  |  |  |  |  |  |  |  | 13,229,000 |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock options, Vesting Period |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Stock Incentive Plan 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares | shares |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Plans | Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock options, Vesting Period |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Expire period |  |  |  |  |  |  | 10 years |  |  |  |  |  |
2017 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, reserved and available for issuance | shares |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Percentage of fair market value to payroll deductions to eligible employees to purchase ordinary shares |  |  |  |  |  |  | 85.00% |  |  |  |  |  |
Maximum fair market value of stock which can be purchased by participant in calendar year |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) | shares | 172,884 | 226,402 | 223,545 | 123,608 | 75,673 | 47,358 |  |  |  |  |  |  |
Sale of stock price per share | $ / shares | $ 3.06 | $ 3.86 | $ 4.22 | $ 5.83 | $ 14.92 | $ 15.02 |  |  |  |  |  |  |
Reserved for future issuance | shares |  |  |  |  |  |  |  |  |  |  | 1,818,273 |  |
2017 Employee Stock Purchase Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of payroll deductions to eligible employees to purchase ordinary shares |  |  |  |  |  |  |  |  |  |  | 15.00% |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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