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Investments and Fair Value Measurement - Summary of Fair Value Measurements of Cash Equivalents and Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | $ 62,361 | $ 73,288
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 9,758 | 18,836
Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 52,603 | 54,452
U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  | 2,997
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 52,603 | 54,452
Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 9,758 | 15,839
Level 1 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 9,758 | 15,839
Level 1 [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 9,758 | 15,839
Level 1 [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 1 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 1 [Member] | U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 1 [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 9,758 | 15,839
Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 52,603 | 57,449
Level 2 [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  | 2,997
Level 2 [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 52,603 | 54,452
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  | 2,997
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities | 52,603 | 54,452
Level 2 [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] | U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |
Level 3 [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total cash equivalents and available-for-sale securities |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Details
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Namespace Prefix: | us-gaap_
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