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Fair Value Measurement - Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Securities and Free Share Liability (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | $ 560,624 | $ 303,878
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 53,165 | 30,496
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents |  | 2,999
Total marketable securities | 213,533 | 155,368
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 59,574 | 95,017
Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 12,311 |
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 17,908 |
U.S. government-sponsored entity debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 257,298 | 53,493
Fair value on recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 53,165 | 33,495
Total marketable securities | 560,624 | 303,878
Total cash equivalents and marketable securities | 613,789 | 337,373
Fair value on recurring basis | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 53,165 | 30,496
Fair value on recurring basis | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents |  | 2,999
Total marketable securities | 213,533 | 155,368
Fair value on recurring basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 53,165 | 30,496
Total marketable securities | 0 | 0
Total cash equivalents and marketable securities | 53,165 | 30,496
Fair value on recurring basis | Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 53,165 | 30,496
Fair value on recurring basis | Level 1 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents |  | 0
Total marketable securities | 0 | 0
Fair value on recurring basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 0 | 2,999
Total marketable securities | 560,624 | 303,878
Total cash equivalents and marketable securities | 560,624 | 306,877
Fair value on recurring basis | Level 2 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 0 | 0
Fair value on recurring basis | Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents |  | 2,999
Total marketable securities | 213,533 | 155,368
Fair value on recurring basis | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 0 | 0
Total marketable securities | 0 | 0
Total cash equivalents and marketable securities | 0 | 0
Fair value on recurring basis | Level 3 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 0 | 0
Fair value on recurring basis | Level 3 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents |  | 0
Total marketable securities | 0 | 0
Fair value on recurring basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 59,574 | 95,017
Fair value on recurring basis | Corporate debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 | 0
Fair value on recurring basis | Corporate debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 59,574 | 95,017
Fair value on recurring basis | Corporate debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 | 0
Fair value on recurring basis | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 12,311 |
Fair value on recurring basis | Certificates of deposit | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 |
Fair value on recurring basis | Certificates of deposit | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 12,311 |
Fair value on recurring basis | Certificates of deposit | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 |
Fair value on recurring basis | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 17,908 |
Fair value on recurring basis | Asset-backed securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 |
Fair value on recurring basis | Asset-backed securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 17,908 |
Fair value on recurring basis | Asset-backed securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 |
Fair value on recurring basis | U.S. government-sponsored entity debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 257,298 | 53,493
Fair value on recurring basis | U.S. government-sponsored entity debt securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 | 0
Fair value on recurring basis | U.S. government-sponsored entity debt securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 257,298 | 53,493
Fair value on recurring basis | U.S. government-sponsored entity debt securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total marketable securities | 0 | 0
Fair value on recurring basis | Free shares asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities | 70 |
Fair value on recurring basis | Free shares asset | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities | 0 |
Fair value on recurring basis | Free shares asset | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities | 0 |
Fair value on recurring basis | Free shares asset | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities | $ 70 |
Fair value on recurring basis | Free shares asset |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities |  | 236
Fair value on recurring basis | Free shares asset | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities |  | 0
Fair value on recurring basis | Free shares asset | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities |  | 0
Fair value on recurring basis | Free shares asset | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities |  | $ 236

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- Definition Amount of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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