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Marketable Securities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 108,371,000 | $ 91,407,000
Gross Unrealized Gains | 3,000 | 3,000
Gross Unrealized Losses | (7,000) | (10,000)
Fair Value | 108,367,000 | 91,400,000
Allowance for credit loss related to available-for-sale debt securities | 0 | 0
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68,019,000 | 60,630,000
Gross Unrealized Gains | 2,000 | 1,000
Gross Unrealized Losses | (4,000) | (7,000)
Fair Value | 68,017,000 | 60,624,000
Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 12,278,000 |
Gross Unrealized Gains | 1,000 |
Gross Unrealized Losses | 0 |
Fair Value | 12,279,000 |
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 28,074,000 | 30,777,000
Gross Unrealized Gains | 0 | 2,000
Gross Unrealized Losses | (3,000) | (3,000)
Fair Value | $ 28,071,000 | $ 30,776,000

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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