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Fair Value of Financial Instruments (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | $ 398,119,000 | $ 441,186,000
Equity method investment, ownership percentage | 25.00% | 25.00%
Equity method investment | $ 1,800,000 | $ 2,800,000
Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 7,402,000 | 18,162,000
U.S. Government bonds and notes |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 102,812,000 | 169,633,000
Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 287,905,000 | 253,391,000
Recurring basis |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 398,119,000 | 441,186,000
Recurring basis | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 7,402,000 | 18,162,000
Recurring basis | U.S. Government bonds and notes |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 102,812,000 | 169,633,000
Recurring basis | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 287,905,000 | 253,391,000
Recurring basis | Quoted market prices in active markets (Level 1) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 7,402,000 | 18,162,000
Recurring basis | Quoted market prices in active markets (Level 1) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 7,402,000 | 18,162,000
Recurring basis | Quoted market prices in active markets (Level 1) | U.S. Government bonds and notes |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Quoted market prices in active markets (Level 1) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Significant other observable inputs (Level 2) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 390,717,000 | 423,024,000
Recurring basis | Significant other observable inputs (Level 2) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Significant other observable inputs (Level 2) | U.S. Government bonds and notes |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 102,812,000 | 169,633,000
Recurring basis | Significant other observable inputs (Level 2) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 287,905,000 | 253,391,000
Recurring basis | Significant unobservable inputs (Level 3) |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | Money market funds |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | U.S. Government bonds and notes |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | 0 | 0
Recurring basis | Significant unobservable inputs (Level 3) | Corporate notes, bonds and commercial paper |  |
Financial assets subject to fair value measurements and the necessary disclosures |  |
Fair value | $ 0 | $ 0

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- Definition Amount of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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