Principal Accounting Policies - Schedule Of Fair Value Measurement Inputs and Valuation Techniques (Detail) - Available for sale debt securities [Member]
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Dec. 31, 2021
Ratio
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| Measurement Input, Cost to Sell [Member] |
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| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
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| Debt Securities, Available-for-sale, Measurement Input |
9.96
|
| Measurement Input, Discount Rate [Member] |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
| Debt Securities, Available-for-sale, Measurement Input |
12
|
| Measurement Input Probability of exit events [Member] | Liquidation Scenario [Member] |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
| Debt Securities, Available-for-sale, Measurement Input |
20
|
| Measurement Input Probability of exit events [Member] | Redemption Scenario [Member] |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
| Debt Securities, Available-for-sale, Measurement Input |
40
|
| Measurement Input Probability of exit events [Member] | IPO scenario [Member] |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
| Debt Securities, Available-for-sale, Measurement Input |
40
|
| Measurement Input Lack Of Marketability Discount [Member] |
|
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
|
| Debt Securities, Available-for-sale, Measurement Input |
22
|