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Share-based Compensation - Schedule of Stock Option Shares Activities (Detail) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options Outstanding, Beginning Balance | 95,653,205 | 131,641,800 | 112,570,000 |
Options, Granted | 19,275,000 | 12,039,050 | 26,610,000 |
Options, Canceled/Forfeited | (6,490,415) | (3,722,285) | (7,538,200) |
Options,Expired |  | (300,000) |  |
Options,Exercised | (53,873,360) | (44,005,360) |  |
Options Outstanding, Ending Balance | 54,564,430 | 95,653,205 | 131,641,800 | 112,570,000
Options Outstanding, Vested and expected to vest | 53,286,128 |  |  |
Outstanding, Weighted Average Exercise Price, Beginning balance | $ 0.2214 | $ 0.1108 | $ 0.0650 |
Options Outstanding, Exercisable | 14,156,930 |  |  |
Granted, Weighted Average Exercise Price | $ 0.6540 | 0.8942 | 0.3020 |
Canceled/Forfeited, Weighted Average Exercise Price | 0.5964 | 0.1930 | 0.0967 |
Expired, Weighted Average Exercise Price |  | 0.0040 |  |
Exercised, Weighted Average Exercise Price | 0.0977 | 0.0543 |  |
Outstanding, Weighted Average Exercise Price, Ending balance | 0.4519 | $ 0.2214 | $ 0.1108 | $ 0.0650
Vested and expected to vest, Weighted Average Exercise Price | 0.4523 |  |  |
Exercisable, Weighted Average Exercise Price | $ 0.3075 |  |  |
Outstanding, Weighted Average Remaining Contractual Life | 2 years 6 months 3 days | 2 years 2 months 1 day | 2 years 8 months 8 days | 3 years 4 months 13 days
Vested and expected to vest, Weighted Average Remaining Contractual Life | 2 years 6 months 3 days |  |  |
Exercisable, Weighted Average Remaining Contractual Life | 1 year 6 months 14 days |  |  |
Outstanding, Aggregate Intrinsic Value | $ 4,264 | $ 47,689 | $ 172,618 | $ 22,688
Vested and expected to vest, Aggregate Intrinsic Value | 4,143 |  |  |
Exercisable, Aggregate Intrinsic Value | $ 3,221 |  |  |

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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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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