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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

X

- 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

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration