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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents by Significant Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash	$ 7,145	$ 2,779
Cash and cash equivalents and Short term investments, Amortized cost	18,954	38,173
Cash and cash equivalents and Short term investments, Estimated fair value	18,954	38,173
Cash and cash equivalents	18,954	38,173	$ 35,795
Money Market Funds | Level 1
Cash And Cash Equivalents And Short Term Investments [Line Items]
Cash equivalents	$ 11,809	$ 35,394

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Cash and cash equivalents and short-term investments.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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