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Fair Value Measurements (Details) - Recurring - Money market funds, included in cash and cash equivalents - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Money market funds, included in cash and cash equivalents	$ 105,679	$ 34,507
Level 1
Assets:
Money market funds, included in cash and cash equivalents	105,679	34,507
Level 2
Assets:
Money market funds, included in cash and cash equivalents	0	0
Level 3
Assets:
Money market funds, included in cash and cash equivalents	$ 0	$ 0

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Fair value portion 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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