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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Securities	$ 136,658	$ 120,147
Fair Value Measurements, Recurring Basis
Assets:
Cash and cash equivalents	6,300	23,200
Total assets measured at fair value	143,007	143,348
Fair Value Measurements, Recurring Basis | Level 1
Assets:
Total assets measured at fair value	128,308	98,334
Fair Value Measurements, Recurring Basis | Level 2
Assets:
Total assets measured at fair value	14,699	45,014
Fair Value Measurements, Recurring Basis | Money market funds
Assets:
Cash and cash equivalents	352	17,202
Fair Value Measurements, Recurring Basis | Money market funds | Level 1
Assets:
Cash and cash equivalents	352	17,202
Fair Value Measurements, Recurring Basis | Money market funds | Level 2
Assets:
Cash and cash equivalents	0	0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities
Assets:
Securities	127,956	81,132
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Level 1
Assets:
Securities	127,956	81,132
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Level 2
Assets:
Securities	0	0
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises
Assets:
Securities	7,700	7,734
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Level 1
Assets:
Securities	0	0
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Level 2
Assets:
Securities	7,700	7,734
Fair Value Measurements, Recurring Basis | Corporate debt securities
Assets:
Securities	6,999	37,280
Fair Value Measurements, Recurring Basis | Corporate debt securities | Level 1
Assets:
Securities	0	0
Fair Value Measurements, Recurring Basis | Corporate debt securities | Level 2
Assets:
Securities	$ 6,999	$ 37,280

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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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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