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Marketable Securities - Schedule of Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 135,701 | $ 149,680
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 Year | 7,563 |
1-5 Years | 15,406 |
5-10 Years | 87 |
Greater than 10 Years | 0 |
Total | 23,056 | 22,155
Government securities - U.S. |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 Year | 4,399 |
1-5 Years | 10,889 |
5-10 Years | 881 |
Greater than 10 Years | 1,684 |
Total | 17,853 | 18,999
Other fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 Year | 1,003 |
1-5 Years | 1,352 |
5-10 Years | 705 |
Greater than 10 Years | 0 |
Total | 3,060 | $ 3,854
Total |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 1 Year | 12,965 |
1-5 Years | 27,647 |
5-10 Years | 1,673 |
Greater than 10 Years | 1,684 |
Total | $ 43,969 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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 (d) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123599081&loc=SL120269850-112803 + Details
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