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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 191,934 | $ 81,411
Unrealized Gains |  | 8
Unrealized Losses | (80) | (4)
Estimated Fair Value | 191,854 | 81,415
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 26,584 | 24,289
Estimated Fair Value | 26,584 | 24,289
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 165,350 | 57,122
Unrealized Gains |  | 8
Unrealized Losses | (80) | (4)
Estimated Fair Value | 165,270 | 57,126
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 4,041 | 3,557
Estimated Fair Value | 4,041 | 3,557
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 22,543 | 18,981
Estimated Fair Value | 22,543 | 18,981
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 45,559 | 3,499
Unrealized Losses | (25) |
Estimated Fair Value | 45,534 | 3,499
U.S. Government Agency Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost |  | 1,751
Estimated Fair Value |  | 1,751
U.S. Government Agency Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 86,860 | 28,685
Unrealized Gains |  | 3
Unrealized Losses | (40) | (2)
Estimated Fair Value | 86,820 | 28,686
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 32,931 | 24,938
Unrealized Gains |  | 5
Unrealized Losses | (15) | (2)
Estimated Fair Value | $ 32,916 | $ 24,941

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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