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Balance Sheet Details - Summary of Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 5,358 | $ 22,616
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 5,358 | 22,621
Short-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,097 | 19,173
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 5,097 | 19,178
Long-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 261 | 3,443
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 261 | 3,443
Government Agency Securities [Member] | Short-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 0 | 2,350
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 2,351
Municipal Bonds [Member] | Short-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 980 | 2,828
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 980 | 2,829
Municipal Bonds [Member] | Long-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 | 1 to 2
Amortized Cost | 261 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 261 | 0
Certificates of Deposit [Member] | Short-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 4,117 | 3,360
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,117 | 3,360
Certificates of Deposit [Member] | Long-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 | 1 to 2
Amortized Cost | 0 | 1,300
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 1,300
Corporate Debentures / Bonds [Member] | Short-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 or less | 1 or less
Amortized Cost | 0 | 10,635
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 0 | 10,638
Corporate Debentures / Bonds [Member] | Long-Term Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity in Years | 1 to 2 | 1 to 2
Amortized Cost | 0 | 2,143
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 0 | $ 2,143

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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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