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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
ARS purchase commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | $ 0 |
Total Realized and Unrealized Gains (Losses), Assets | (137) |
Purchases and Issuances | 0 |
Sales and Settlements | 0 |
Transfers In (Out) | 332 |
Assets Ending Balance | 195 | $ 0
Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 0 | 101
Total Realized and Unrealized Gains (Losses), Assets |  | 5
Transfers In (Out) |  | (106)
Assets Ending Balance |  | 0
Auction rate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 0 | 21,699
Total Realized and Unrealized Gains (Losses), Assets | (165) | 1
Purchases and Issuances | 1,300 | 0
Sales and Settlements | 0 | (350)
Transfers In (Out) | 29,566 | (21,350)
Assets Ending Balance | $ 30,701 | $ 0

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- Definition Fair value assets measured on recurring basis change in realized and unrealized gain (loss) included in other income. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sales settlements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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