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Fair Value Measurements - Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Marketable Securities and Free Share Asset/Liability (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | $ 270,028 | $ 259,715
Money market funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 15,233 | 103,291
Commercial paper securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 4,990 |
Total marketable securities | 180,399 | 177,224
Corporate debt securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | 70,948 | 63,870
U.S. government sponsored entity debt securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | 18,681 | 18,621
Fair value on recurring basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 20,223 | 103,291
Total marketable securities | 270,028 | 259,715
Total cash equivalents and marketable securities and free shares asset | 290,251 | 363,006
Total liabilities |  | 154
Fair value on recurring basis [Member] | Money market funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 15,233 | 103,291
Fair value on recurring basis [Member] | Commercial paper securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 4,990 |
Total marketable securities | 180,399 | 177,224
Fair value on recurring basis [Member] | Free Shares Asset [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities and free shares asset | 355 |
Fair value on recurring basis [Member] | Free Share Liability [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total liabilities |  | 154
Fair value on recurring basis [Member] | Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 15,233 | 103,291
Total cash equivalents and marketable securities and free shares asset | 15,233 | 103,291
Fair value on recurring basis [Member] | Level 1 [Member] | Money market funds [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 15,233 | 103,291
Fair value on recurring basis [Member] | Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 4,990 |
Total marketable securities | 270,028 | 259,715
Total cash equivalents and marketable securities and free shares asset | 275,018 | 259,715
Fair value on recurring basis [Member] | Level 2 [Member] | Commercial paper securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents | 4,990 |
Total marketable securities | 180,399 | 177,224
Fair value on recurring basis [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total liabilities |  | 154
Fair value on recurring basis [Member] | Level 3 [Member] | Free Shares Asset [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total cash equivalents and marketable securities and free shares asset | 355 |
Fair value on recurring basis [Member] | Level 3 [Member] | Free Share Liability [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total liabilities |  | 154
Fair value on recurring basis [Member] | Corporate debt securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | 70,948 | 63,870
Fair value on recurring basis [Member] | Corporate debt securities [Member] | Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | 70,948 | 63,870
Fair value on recurring basis [Member] | U.S. government sponsored entity debt securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | 18,681 | 18,621
Fair value on recurring basis [Member] | U.S. government sponsored entity debt securities [Member] | Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Total marketable securities | $ 18,681 | $ 18,621

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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 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: 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=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value portion 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. + References No definition available. + Details
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