Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Cash and Cash Equivalents and Restricted Cash - Summary of Cash and Cash Equivalents Balance (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	¥ 3,138,008	$ 492,422	¥ 5,727,029
Restricted cash			6,363
Total cash, cash equivalents and restricted cash	3,138,008		5,733,392
CHINA
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	627,058	627,058	265,401	$ 265,401
Restricted cash			6,363
UNITED STATES
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	2,446,199	383,680	5,414,276	829,774
GBP
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	45,931	5,337
EUR
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	10,895	1,509	47,226	5,885
HKD
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	6,450	7,879
JPY
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	999	17,793
SGD
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	¥ 476	$ 99	¥ 126	$ 26