XML 72 R45.htm IDEA: XBRL DOCUMENT
v3.20.1

Cash and Cash Equivalents and Investments (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cash and Cash Equivalents |  |
Realized Investment Gains (Losses) | $ 0 |
Cash |  |
Cash and Cash Equivalents |  |
Available-for-sale Securities, Amortized Cost Basis | 36,112 | $ 80,386
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities, Current | 36,112 | 80,386
US Treasury Securities |  |
Cash and Cash Equivalents |  |
Available-for-sale Securities, Amortized Cost Basis | 235,463 | 73,983
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 94 | 0
Available-for-sale Securities, Gross Unrealized Losses | (10) | (9)
Available-for-sale Securities, Current | 235,547 | 73,974
Corporate Debt Securities [Member] |  |
Cash and Cash Equivalents |  |
Available-for-sale Securities, Amortized Cost Basis |  | 5,695
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments |  | 0
Available-for-sale Securities, Gross Unrealized Losses |  | (3)
Available-for-sale Securities, Current |  | 5,692
Short-term Investments |  |
Cash and Cash Equivalents |  |
Available-for-sale Securities, Amortized Cost Basis | 235,463 | 79,678
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 94 | 0
Available-for-sale Securities, Gross Unrealized Losses | (10) | (12)
Available-for-sale Securities, Current | 235,547 | 79,666
Cash and Cash Equivalents and Investments |  |
Cash and Cash Equivalents |  |
Available-for-sale Securities, Amortized Cost Basis | 271,575 | 160,064
Available-for-sale Securities, Gross Unrealized Gain Accumulated in Investments | 94 | 0
Available-for-sale Securities, Gross Unrealized Losses | (10) | (12)
Available-for-sale Securities, Current | $ 271,659 | $ 160,052

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
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 investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, 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
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesCurrent
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_CashAndCashEquivalentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
Name: | us-gaap_RealizedInvestmentGainsLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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