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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Securities	$ 124,681	$ 91,400
Fair Value Measurements, Recurring Basis
Assets:
Cash and cash equivalents	18,500	52,000
Total assets measured at fair value	143,195	143,403
Fair Value Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets measured at fair value	15,014	49,004
Fair Value Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2)
Assets:
Total assets measured at fair value	128,181	94,399
Fair Value Measurements, Recurring Basis | Money market funds
Assets:
Cash and cash equivalents	15,014	49,004
Fair Value Measurements, Recurring Basis | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	15,014	49,004
Fair Value Measurements, Recurring Basis | Money market funds | Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities
Assets:
Securities	79,787	60,623
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Securities	0	0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
Assets:
Securities	79,787	60,623
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises
Assets:
Securities	4,570
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Securities	0
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Other Observable Inputs (Level 2)
Assets:
Securities	4,570
Fair Value Measurements, Recurring Basis | Corporate debt securities
Assets:
Securities	43,824	33,776
Fair Value Measurements, Recurring Basis | Corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Securities	0	0
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Other Observable Inputs (Level 2)
Assets:
Securities	$ 43,824	$ 33,776

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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