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Investments and Fair Value Measurement - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 62,335 | $ 73,262
Gross Unrealized Gains | 26 | 26
Gross Unrealized (Losses) |  |
Estimated Fair Value | 62,361 | 73,288
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,758 | 18,836
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value | 9,758 | 18,836
Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,577 | 54,426
Gross Unrealized Gains | 26 | 26
Gross Unrealized (Losses) |  |
Estimated Fair Value | 52,603 | 54,452
Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,758 | 15,839
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value | 9,758 | 15,839
U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 2,997
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value |  | 2,997
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,577 | 54,426
Gross Unrealized Gains | 26 | 26
Gross Unrealized (Losses) |  |
Estimated Fair Value | $ 52,603 | $ 54,452

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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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