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Available-for-Sale-Securities - Schedule of Available-for-Sale Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 37,796 | $ 22,766
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (12) | (1)
Estimated Fair Value | 37,784 | 22,768
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 13,506 | 11,673
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (11) | (1)
Estimated Fair Value | 13,495 | 11,675
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 15,481 | 11,093
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 15,481 | 11,093
Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 8,613 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 8,612 | 0
Sovereign government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 196 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 196 | $ 0

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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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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