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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 81,411 | $ 196,113
Unrealized Gains | 8 | 78
Unrealized Losses | (4) | (66)
Estimated Fair Value | 81,415 | 196,125
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 24,289 | 44,806
Unrealized Gains |  | 7
Unrealized Losses |  | (1)
Estimated Fair Value | 24,289 | 44,812
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 57,122 | 151,307
Unrealized Gains | 8 | 71
Unrealized Losses | (4) | (65)
Estimated Fair Value | 57,126 | 151,313
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 3,557 | 4,561
Estimated Fair Value | 3,557 | 4,561
Money Market Funds | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 18,981 | 21,193
Estimated Fair Value | 18,981 | 21,193
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 | 28,685 | 17,628
Unrealized Gains | 3 |
Unrealized Losses | (2) | (6)
Estimated Fair Value | 28,686 | 17,622
U.S. Treasuries | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 3,499 |
Estimated Fair Value | 3,499 |
Corporate Debt Securities | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost |  | 19,052
Unrealized Gains |  | 7
Unrealized Losses |  | (1)
Estimated Fair Value |  | 19,058
Corporate Debt Securities | Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 24,938 | 133,679
Unrealized Gains | 5 | 71
Unrealized Losses | (2) | (59)
Estimated Fair Value | $ 24,941 | $ 133,691

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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