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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 216,127 | $ 191,934
Unrealized Gains | 7 |
Unrealized Losses | (91) | (80)
Estimated Fair Value | 216,043 | 191,854
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 28,726 | 26,584
Estimated Fair Value | 28,726 | 26,584
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 187,401 | 165,350
Unrealized Gains | 7 |
Unrealized Losses | (91) | (80)
Estimated Fair Value | 187,317 | 165,270
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 3,313 | 4,041
Estimated Fair Value | 3,313 | 4,041
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 25,413 | 22,543
Estimated Fair Value | 25,413 | 22,543
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 37,131 | 45,559
Unrealized Losses | (12) | (25)
Estimated Fair Value | 37,119 | 45,534
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 45,230 | 86,860
Unrealized Losses | (52) | (40)
Estimated Fair Value | 45,178 | 86,820
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 105,040 | 32,931
Unrealized Gains | 7 |
Unrealized Losses | (27) | (15)
Estimated Fair Value | $ 105,020 | $ 32,916

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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=82897076&loc=d3e27161-111563 + Details
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