Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) customer	Sep. 30, 2021 USD ($)
Concentration of risk, financial assets
Financial instruments with off-balance sheet risk of accounting loss, assets	$ 0	$ 0
Concentration risk, financial liabilities
Financial instruments with off-balance sheet risk of accounting loss, liabilities	0	0
Total revenue	$ 1,287	$ 2,587
Customer Concentration Risk
Concentration risk, financial liabilities
Number of major customers \| customer	3
Customer Concentration Risk \| Sales Revenue \| Three Customers
Concentration risk, financial liabilities
Total revenue	$ 400
Concentration risk, percentage	92.00%
Customer Concentration Risk \| Accounts Receivable \| Customer One
Concentration risk, financial liabilities
Concentration risk, percentage	35.00%
Customer Concentration Risk \| Accounts Receivable \| Customer Two
Concentration risk, financial liabilities
Concentration risk, percentage	34.00%
Customer Concentration Risk \| Accounts Receivable \| Customer Three
Concentration risk, financial liabilities
Concentration risk, percentage	27.00%

Number of major customers.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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