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Investments and Fair Value Measurement (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	$ 73,288	$ 82,624
Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	18,836	15,258
Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	54,452	67,366
Money market funds [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	15,839	15,258
U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	2,997
U.S. government sponsored entity debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	54,452	27,013
U.S. treasury debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities		752
Corporate debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities		39,601
Level 1 [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	15,839	15,258
Level 1 [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	15,839	15,258
Level 1 [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 1 [Member] | Money market funds [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	15,839	15,258
Level 1 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 1 [Member] | U.S. government sponsored entity debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 1 [Member] | U.S. treasury debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 1 [Member] | Corporate debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 2 [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	57,449	67,366
Level 2 [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	2,997
Level 2 [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	54,452	67,366
Level 2 [Member] | Money market funds [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	2,997
Level 2 [Member] | U.S. government sponsored entity debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities	54,452	27,013
Level 2 [Member] | U.S. treasury debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities		752
Level 2 [Member] | Corporate debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities		39,601
Level 3 [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | Money market funds [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | U.S. government sponsored entity debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | U.S. treasury debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities
Level 3 [Member] | Corporate debt securities [Member] | Marketable securities [Member] | Available-for-sale securities [Member]
Summary of fair value measurements of cash equivalents and available-for-sale marketable securities
Total cash equivalents and marketable securities

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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=7578670&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_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration