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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 ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 187,476,000 | $ 108,895,000
Amortized Cost | 1,044,433,000 | 1,041,108,000
Unrealized Gain | 197,000 | 270,000
Unrealized (Loss) | (87,000) | (31,000)
Fair Value | 1,044,543,000 | 1,041,347,000
Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 42,723,000 | 22,114,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 42,723,000 | 22,114,000
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 | 154,072,000 | 71,038,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 154,072,000 | 71,038,000
Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 847,638,000 | 947,956,000
Unrealized Gain | 197,000 | 270,000
Unrealized (Loss) | (87,000) | (31,000)
Fair Value | 847,748,000 | 948,195,000
Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 151,162,000 | 169,324,000
Unrealized Gain | 17,000 | 43,000
Unrealized (Loss) | (75,000) | (26,000)
Fair Value | 151,104,000 | 169,341,000
Level II | U.S. treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 501,018,000 | 576,652,000
Unrealized Gain | 174,000 | 223,000
Unrealized (Loss) | (12,000) | (4,000)
Fair Value | 501,180,000 | 576,871,000
Level II | U.S. government agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 15,565,000 | 15,617,000
Unrealized Gain | 6,000 | 4,000
Unrealized (Loss) | 0 | (1,000)
Fair Value | 15,571,000 | 15,620,000
Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 179,893,000 | 186,363,000
Unrealized Gain | 0 | 0
Unrealized (Loss) | 0 | 0
Fair Value | 179,893,000 | 186,363,000
Cash & Cash Equivalents | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 187,476,000 | 108,895,000
Cash & Cash Equivalents | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 40,064,000 | 19,523,000
Cash & Cash Equivalents | Fair Value, Recurring | Level I | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 147,412,000 | 64,378,000
Cash & Cash Equivalents | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 24,994,000
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 | 0
Cash & Cash Equivalents | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 24,994,000
Available-for-sale securities | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 847,748,000 | 923,201,000
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 | 847,748,000 | 923,201,000
Available-for-sale securities | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 151,104,000 | 169,341,000
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 | 501,180,000 | 576,871,000
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 | 15,571,000 | 15,620,000
Available-for-sale securities | Fair Value, Recurring | Level II | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 179,893,000 | 161,369,000
Restricted Cash | Fair Value, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 9,319,000 | 9,251,000
Restricted Cash | Fair Value, Recurring | Cash |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 2,659,000 | 2,591,000
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
Restricted Cash | Fair Value, Recurring | Level II |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
Restricted Cash | Fair Value, Recurring | Level II | Corporate bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value | 0 | 0
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
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
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=121645371&loc=d3e27161-111563 + Details
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