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Financial Instruments and Fair Value Measurements - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Available-for-Sale Securities |  |
Amortized Cost | $ 382,465 | $ 306,706
Gross Unrealized Gains | 6 | 35
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 382,471 | 306,741
Debt securities, contractual maturities | 1 year |
Debt securities, average duration | 1 month |
Credit loss, available-for-sale debt securities | $ 0 |
U.S. government securities |  |
Available-for-Sale Securities |  |
Amortized Cost | 3,993 | 53,799
Gross Unrealized Gains | 6 | 35
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3,999 | 53,834
U.S. commercial paper |  |
Available-for-Sale Securities |  |
Amortized Cost |  | 18,915
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 18,915
Money market funds |  |
Available-for-Sale Securities |  |
Amortized Cost | 378,472 | 233,992
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 378,472 | $ 233,992

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- Definition Average period of duration between issuance and maturity of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=118939692&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=118939692&loc=d3e27161-111563 + Details
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