Fuzhou Note Receivable (Details) - 1 months ended May 31, 2020 ¥ in Millions, $ in Millions	CNY (¥)	USD ($)
Fuzhou Note Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable provided	¥ 3.0	$ 0.4
Notes receivable, current \| ¥	¥ 3.3
Reserve against note receivable		0.5
Zhu Note Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, current		$ 0.5
Repayment period	3 months

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant