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Related Parties - Revenue, Accounts Receivable and Contract Liabilities for Investors of the Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Stockholder A
Related Party Transaction [Line Items]
Accounts receivable	$ 0	$ 22
Stockholder B
Related Party Transaction [Line Items]
Contract liabilities (current)	0	65
Stockholder D
Related Party Transaction [Line Items]
Contract liabilities (current)	0	500
Prototype sales | Stockholder A
Related Party Transaction [Line Items]
Revenue	0	60
Development contracts | Stockholder B
Related Party Transaction [Line Items]
Revenue	0	100
Development contracts | Stockholder C
Related Party Transaction [Line Items]
Revenue	$ 0	$ 1,050

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Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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