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Short-term investments - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Debt securities, available-for-sale, unrealized loss	$ 2,430,000	$ 2,430,000
Short-term investments			$ 0
Short-Term Investments [Member]
Debt Securities, Available-for-Sale [Line Items]
Proceeds from sale of debt securities, available-for-Sale		0
Payments to acquire debt securities, available-for-Sale		196,800,000
Debt securities, available-for-sale, unrealized loss	$ 2,400,000	$ 2,429,000

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- Definition

Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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