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Summary of Significant Accounting Policies - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 8,711	$ 2,273	$ 17,029	$ 12,233
United States
Disaggregation of Revenue [Line Items]
Revenue	7,103	659	15,349	9,290
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 1,608	$ 1,614	$ 1,680	$ 2,943

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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