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Investments Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | $ 68,241 | $ 64,851
Gross unrealized holding gains | 342 | 2
Gross unrealized holding losses | (4) | (29)
Fair value | 68,579 | 64,824
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 15,166 | 13,932
Gross unrealized holding gains | 22 | 1
Gross unrealized holding losses | 0 | (2)
Fair value | 15,188 | 13,931
Corporate notes/bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 44,798 | 36,620
Gross unrealized holding gains | 271 | 1
Gross unrealized holding losses | (4) | (24)
Fair value | 45,065 | 36,597
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 2,257 | 4,513
Gross unrealized holding gains | 18 | 0
Gross unrealized holding losses | 0 | (1)
Fair value | 2,275 | 4,512
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized costs | 6,020 | 9,786
Gross unrealized holding gains | 31 | 0
Gross unrealized holding losses | 0 | (2)
Fair value | $ 6,051 | $ 9,784

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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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