Nature of Business and Organization, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2021 CNY (¥)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Insurance limits	$ 250		¥ 500
Notes receivable	0	$ 40
Deposits	63,370	6,412
Asset impairment charges		0
Unrecognized tax benefits, income tax penalties and interest expense	$ 0	$ 0
Number of operating segments \| segment	1
Number of reportable segments \| segment	1

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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