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Investments and Fair Value Measurements Short-Term and Long-Term Marketable Securities (Details) - Fair Value, Measurements, Recurring - Short-term Investments $ in Thousands | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | $ 318,008
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 224
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (30)
Available-for-sale Securities, Total | 318,202
Corporate Bonds |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | 210,891
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 142
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (27)
Available-for-sale Securities, Total | 211,006
Commercial paper |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | 14,426
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0
Available-for-sale Securities, Total | 14,426
U.S. government treasury bonds |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | 70,587
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 65
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (2)
Available-for-sale Securities, Total | 70,650
U.S. government agency bonds |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | 22,085
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 17
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (1)
Available-for-sale Securities, Total | 22,101
Certificates of deposit |
Debt Securities, Available-for-sale [Line Items] |
Available-for-sale Securities, Amortized Cost Basis, Total | 19
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0
Available-for-sale Securities, Total | $ 19

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- 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=82897076&loc=d3e27161-111563 + Details
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