XML 70 R56.htm IDEA: XBRL DOCUMENT
v3.20.4

Cash and Cash Equivalents, and Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | $ 1,652,188 |
Fair Value | 1,653,994 |
Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 479,853 | $ 387,520
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 479,853 | 387,520
Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 664,119 | 380,686
Unrealized Gain | 1,502 | 470
Unrealized Loss | (54) | (82)
Fair Value | 665,567 | 381,074
Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 523,270 | 310,102
Unrealized Gain | 641 | 539
Unrealized Loss | (283) | (158)
Fair Value | 523,628 | 310,483
Cash | Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 15,054 | 241,355
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 15,054 | 241,355
Money market funds | Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 464,799 | 146,165
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 464,799 | 146,165
Commercial paper | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 204,152 | 7,489
Unrealized Gain | 24 | 0
Unrealized Loss | (6) | 0
Fair Value | 204,170 | 7,489
Corporate debt securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 459,967 | 318,946
Unrealized Gain | 1,478 | 425
Unrealized Loss | (48) | (78)
Fair Value | 461,397 | 319,293
Corporate debt securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 484,275 | 295,103
Unrealized Gain | 605 | 533
Unrealized Loss | (283) | (158)
Fair Value | 484,597 | 295,478
Agency Securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost |  | 10,000
Unrealized Gain |  | 6
Unrealized Loss |  | 0
Fair Value |  | 10,006
Agency Securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost | 38,995 | 14,999
Unrealized Gain | 36 | 6
Unrealized Loss | 0 | 0
Fair Value | $ 39,031 | 15,005
U.S. treasury securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Adjusted Cost |  | 44,251
Unrealized Gain |  | 39
Unrealized Loss |  | (4)
Fair Value |  | $ 44,286

X
- 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
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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=121645371&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=121558606&loc=SL82898722-210454 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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=121558606&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=121553693&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=121645371&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_OtherLongTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |