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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Securities | $ 79,022 | $ 89,284
Fair Value Measurements, Recurring Basis |  |
Assets: |  |
Cash and cash equivalents | 64,500 | 73,200
Total assets measured at fair value | 143,479 | 162,506
Fair Value Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Total assets measured at fair value | 45,708 | 46,149
Fair Value Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total assets measured at fair value | 97,771 | 116,357
Fair Value Measurements, Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total assets measured at fair value | 0 | 0
Fair Value Measurements, Recurring Basis | Money market funds |  |
Assets: |  |
Cash and cash equivalents | 45,708 | 46,149
Fair Value Measurements, Recurring Basis | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 45,708 | 46,149
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 | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Fair Value Measurements, Recurring Basis | U.S. Treasury securities |  |
Assets: |  |
Securities | 60,005 |
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 0 |
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 60,005 |
Fair Value Measurements, Recurring Basis | U.S. Treasury securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | 0 |
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises |  |
Assets: |  |
Securities | 14,007 | 13,222
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Securities | 14,007 | 13,222
Fair Value Measurements, Recurring Basis | Government-sponsored enterprises | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | 0 | 0
Fair Value Measurements, Recurring Basis | Corporate debt securities |  |
Assets: |  |
Securities | 23,759 | 103,135
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 | 23,759 | 103,135
Fair Value Measurements, Recurring Basis | Corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Securities | $ 0 | $ 0

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition 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. + References No definition available. + Details
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