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Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 150,626 | $ 159,917
Gross Unrealized Holding Gains | 1,024 | 125
Gross Unrealized Holding Losses | (5) | (475)
Estimated Fair Value | 151,645 | 159,567
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,130 | 126,522
Gross Unrealized Holding Gains | 856 | 54
Gross Unrealized Holding Losses | (5) | (473)
Estimated Fair Value | 125,981 | 126,103
Bond and mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 25,371 | 25,052
Gross Unrealized Holding Gains | 56 | 0
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | 25,427 | 25,052
Equity investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125 | 126
Gross Unrealized Holding Gains | 112 | 71
Gross Unrealized Holding Losses | 0 | 0
Estimated Fair Value | $ 237 | 197
Certificate of deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 8,217
Gross Unrealized Holding Gains |  | 0
Gross Unrealized Holding Losses |  | (2)
Estimated Fair Value |  | $ 8,215

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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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