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Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 76,402 | $ 85,049
Gross Unrealized Gain | 4,552 | 11,163
Gross Unrealized (Loss) | (12) | (49)
Fair Value | 80,942 | 96,163
Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 105 | 59,302
Fair Value | 105 | 59,302
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,974 |
Gross Unrealized Gain | 8 |
Fair Value | 18,982 |
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 57,323 | 25,747
Gross Unrealized Gain | 57 |
Gross Unrealized (Loss) | (12) | (49)
Fair Value | 57,368 | 25,698
Marketable equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Gain | 4,487 | 11,163
Fair Value | $ 4,487 | $ 11,163

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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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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