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Marketable Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cash equivalents and marketable securities |  |
Maximum maturity period of available-for-sale securities (in years) | 3 years |
Fair value | $ 398,119 | $ 441,186
Amortized cost | 399,182 | 441,244
Gross unrealized gains | 8 | 64
Gross unrealized losses | (1,071) | (122)
Cash, cash equivalents and marketable securities |  |
Cash, fair value | 87,490 | 61,463
Cash, amortized cost | 87,490 | 61,463
Fair Value | 485,609 | 502,649
Amortized Cost | 486,672 | 502,707
Gross unrealized gains | 8 | 64
Gross unrealized losses | (1,071) | (122)
Money market funds |  |
Cash equivalents and marketable securities |  |
Fair value | 7,402 | 18,162
Amortized cost | 7,402 | 18,162
Gross unrealized gains | 0 | 0
Gross unrealized losses | $ 0 | $ 0
Weighted rate of return (as a percentage) | 0.02% | 0.01%
U.S. Government bonds and notes |  |
Cash equivalents and marketable securities |  |
Fair value | $ 102,812 | $ 169,633
Amortized cost | 103,113 | 169,670
Gross unrealized gains | 0 | 3
Gross unrealized losses | $ (301) | $ (40)
Weighted rate of return (as a percentage) | 0.29% | 0.12%
Corporate notes, bonds and commercial paper |  |
Cash equivalents and marketable securities |  |
Fair value | $ 287,905 | $ 253,391
Amortized cost | 288,667 | 253,412
Gross unrealized gains | 8 | 61
Gross unrealized losses | $ (770) | $ (82)
Weighted rate of return (as a percentage) | 0.22% | 0.20%

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- Definition This item represents the amortized cost of cash, cash equivalents and marketable securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This element represents the aggregate of cash, cash equivalents and marketable securities reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. + References No definition available. + Details
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- Definition This item represents the gross unrealized gains for cash, cash equivalents and marketable securities + References No definition available. + Details
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- Definition This item represents the gross unrealized losses for cash, cash equivalents and marketable securities. + References No definition available. + Details
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- Definition Represents the maximum maturity period of securities invested by the entity. + References No definition available. + Details
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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=123581744&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=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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