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Financial Instruments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Marketable Securities [Line Items] |  |
Debt securities, Cost | $ 118,263 | $ 45,782
Debt securities, Gross Unrealized Gains | 29 | 33
Debt securities, Gross Unrealized Losses | (46) | (13)
Debt securities, Allowance for Credit Losses | 0 |
Debt securities, Estimated Fair Values | 118,246 | 45,802
Equity securities, Cost | 3,849 | 6,006
Equity securities, Gross Unrealized Gains | 0 | 0
Equity securities, Gross Unrealized Losses | 0 | (2,281)
Equity securities, Allowance for Credit Losses | 0 |
Equity securities, Estimated Fair Values | 3,849 | 3,725
Marketable securities, Cost | 122,112 | 51,788
Marketable securities, Gross Unrealized Gains | 29 | 33
Marketable securities, Gross Unrealized Losses | (46) | (2,294)
Marketable securities, Allowance for Credit Losses | 0 |
Marketable securities, Estimated Fair Values | 122,095 | 49,527
Available-for-sale debt securities |  |
Marketable Securities [Line Items] |  |
Marketable securities, Estimated Fair Values | 86,947 | 45,802
Corporate bonds and notes |  |
Marketable Securities [Line Items] |  |
Debt securities, Cost | 69,973 | 41,730
Debt securities, Gross Unrealized Gains | 29 | 29
Debt securities, Gross Unrealized Losses | (42) | (13)
Debt securities, Allowance for Credit Losses | 0 |
Debt securities, Estimated Fair Values | 69,960 | 41,746
Commercial paper |  |
Marketable Securities [Line Items] |  |
Debt securities, Cost | 15,991 | 4,052
Debt securities, Gross Unrealized Gains | 0 | 4
Debt securities, Gross Unrealized Losses | (4) | 0
Debt securities, Allowance for Credit Losses | 0 |
Debt securities, Estimated Fair Values | 15,987 | 4,056
Treasury and agency notes and bills |  |
Marketable Securities [Line Items] |  |
Debt securities, Cost | 32,299 |
Debt securities, Gross Unrealized Gains | 0 |
Debt securities, Gross Unrealized Losses | 0 |
Debt securities, Allowance for Credit Losses | 0 |
Debt securities, Estimated Fair Values | 32,299 |
Money market funds |  |
Marketable Securities [Line Items] |  |
Equity securities, Cost | 3,849 | 2,601
Equity securities, Gross Unrealized Gains | 0 | 0
Equity securities, Gross Unrealized Losses | 0 | 0
Equity securities, Allowance for Credit Losses | 0 |
Equity securities, Estimated Fair Values | 3,849 | 2,601
Cash and cash equivalents |  |
Marketable Securities [Line Items] |  |
Marketable securities, Estimated Fair Values | 35,148 |
Marketable equity securities |  |
Marketable Securities [Line Items] |  |
Equity securities, Cost |  | 3,405
Equity securities, Gross Unrealized Gains |  | 0
Equity securities, Gross Unrealized Losses |  | (2,281)
Equity securities, Estimated Fair Values | $ 0 | 1,124
Equity securities |  |
Marketable Securities [Line Items] |  |
Marketable securities, Estimated Fair Values |  | $ 1,124

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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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