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Fair Value Measurements - Schedule of Cash and Available-for-sale Debt Securities' Amortized Cost, Unrealized Gains (Losses) and Fair Value by Significant Investment Category (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 313,983,000 | $ 138,976,000
Amortized Cost | 1,076,637,000 | 643,471,000
Unrealized Gain | 1,336,000 | 190,000
Unrealized (Loss) | (35,000) | (53,000)
Fair Value | 1,077,938,000 | 643,608,000
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 17,036,000 | 24,631,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 17,036,000 | 24,631,000
Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 251,805,000 | 32,856,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 251,805,000 | 32,856,000
Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 807,796,000 | 585,984,000
Unrealized Gain | 1,336,000 | 190,000
Unrealized (Loss) | (35,000) | (53,000)
Fair Value | 809,097,000 | 586,121,000
Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 137,047,000 | 84,054,000
Unrealized Gain | 404,000 | 22,000
Unrealized (Loss) | (13,000) | (30,000)
Fair Value | 137,438,000 | 84,046,000
Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 495,473,000 | 311,083,000
Unrealized Gain | 905,000 | 151,000
Unrealized (Loss) | (16,000) | (23,000)
Fair Value | 496,362,000 | 311,211,000
Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 50,866,000 | 95,380,000
Unrealized Gain | 26,000 | 17,000
Unrealized (Loss) | (6,000) | 0
Fair Value | 50,886,000 | 95,397,000
Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 124,410,000 | 95,467,000
Unrealized Gain | 1,000 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 124,411,000 | 95,467,000
Cash & Cash Equivalents | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 313,983,000 | 138,976,000
Cash & Cash Equivalents | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 14,849,000 | 24,631,000
Cash & Cash Equivalents | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 245,145,000 | 26,196,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 53,989,000 | 88,149,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 22,549,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 53,989,000 | 65,600,000
Available-for-sale securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 755,108,000 | 497,972,000
Available-for-sale securities | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Available-for-sale securities | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Available-for-sale securities | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 755,108,000 | 497,972,000
Available-for-sale securities | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 137,438,000 | 84,046,000
Available-for-sale securities | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 496,362,000 | 311,211,000
Available-for-sale securities | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 50,886,000 | 72,848,000
Available-for-sale securities | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 70,422,000 | 29,867,000
Long-term Restricted Cash | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 8,847,000 | 6,660,000
Long-term Restricted Cash | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 2,187,000 | 0
Long-term Restricted Cash | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 6,660,000 | 6,660,000
Long-term Restricted Cash | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Long-term Restricted Cash | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Long-term Restricted Cash | Fair Value, Recurring | Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Long-term Restricted Cash | Fair Value, Recurring | Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Long-term Restricted Cash | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | $ 0 | $ 0

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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 of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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