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Summary of Significant Accounting Policies - Disaggregation Our Geographical Revenues by Origin (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 48,361	$ 11,172	$ 9,389	$ 9,774	$ 9,242	$ 9,583	$ 8,464	$ 6,653	$ 78,696	$ 33,942
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenues									49,555	28,801
Europe, the Middle East and Africa (EMEA) [Member]
Disaggregation of Revenue [Line Items]
Revenues									20,316	4,523
Asia Pacific (APAC) [Member]
Disaggregation of Revenue [Line Items]
Revenues									$ 8,825	$ 618

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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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