Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) customer
Concentration of risk, financial assets
Financial instruments with off-balance sheet risk of accounting loss, assets	$ 0
Concentration risk, financial liabilities
Financial instruments with off-balance sheet risk of accounting loss, liabilities	0
Total revenue	$ 116
Customer Concentration Risk
Concentration risk, financial liabilities
Number of major customers \| customer	2
Customer Concentration Risk \| Sales Revenue \| Two Customers [Member]
Concentration risk, financial liabilities
Total revenue	$ 100
Concentration risk, percentage	85.00%
Customer Concentration Risk \| Accounts Receivable \| Two Customers [Member]
Concentration risk, financial liabilities
Concentration risk, percentage	24.00%

Number of major customers.

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- Definition

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.

+ References

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- References

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- Definition

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.

+ References

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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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