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Share-based Compensation - Additional Information (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Millions |  | 12 Months Ended |  |  |  |
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Mar. 07, 2011 | Dec. 31, 2021 CNY (¥) ¥ / shares shares | Dec. 31, 2021 CNY (¥) $ / shares shares | Dec. 31, 2020 CNY (¥) ¥ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 $ / shares | Dec. 31, 2021 USD ($) shares | Sep. 17, 2021 shares | Mar. 18, 2020 shares | Mar. 17, 2020 shares
Weighted average grant date fair value of options granted | (per share) |  | ¥ 1.44 | $ 0.23 | ¥ 1.96 |  | $ 0 |  |  |  |
Vesting of restricted share units, shares |  | 1,812,960 |  | 190,160 | 0 |  |  |  |  |
Cash settled equity instrument granted under share-based payment arrangements | ¥ |  | ¥ 0 |  | ¥ 0 | ¥ 0 |  |  |  |  |
Compensation cost for share-based payment arrangements | ¥ |  | ¥ 0 |  | ¥ 0 | ¥ 0 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares authorized |  | 1,268,785,000 | 1,268,785,000 | 1,268,785,000 |  |  | 1,268,785,000 |  |  |
Common Class A [Member] | Kastle Limited [Member] |  |  |  |  |  |  |  |  |  |
Number Of Ordinary Shares Held For The Benefit Of Senior Management Directors And Employees |  | 9,020,630 | 9,020,630 |  |  |  | 9,020,630 |  |  |
Common Class A [Member] | Futu Securities(Hong Kong) Limited [Member] |  |  |  |  |  |  |  |  |  |
Number Of Ordinary Shares Held For The Benefit Of Senior Management Directors And Employees |  | 7,140,380 | 7,140,380 |  |  |  | 7,140,380 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |  |
Award vesting percentage | 25.00% |  |  |  |  |  |  |  |  |
Restricted shares units, Granted |  |  |  | 2,607,000 | 10,428,000 |  |  |  |  |
Vesting of restricted share units, shares |  | 6,232,000 |  | 9,857,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Restricted shares units, Granted |  | 13,080,200 |  | 9,611,020 |  |  |  |  |  |
Vesting of restricted share units, shares |  | 3,018,000 |  | 0 |  |  |  |  |  |
2012 Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |  |
2019 Incentive Plan and the Amended and Restated 2019 Share Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |  |
Unrecognized compensation expenses, unvested awards |  | ¥ 75,300 | $ 75,300 | ¥ 62,600 |  |  | $ 11.9 |  |  |
Unrecognized compensation expenses, weighted average period for recognition |  | 2 years 6 months 29 days |  | 2 years 8 months 12 days |  |  |  |  |  |
2019 Incentive Plan [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares authorized |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 | 40,000,000
2019 Incentive Plan [Member] | Common Class A [Member] | Restated [Member] |  |  |  |  |  |  |  |  |  |
Ordinary shares, shares authorized |  |  |  |  |  |  |  | 170,000,000 |  |
2019 Incentive Plan [Member] | Common Class A [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |  |
2018 Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 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 The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(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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