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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Presentation of fair value of financial assets using the inputs |  |
Total financial assets | $ 16,211 | $ 13,866
Money market funds |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets | 16,211 | 13,866
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets | 16,211 | 13,866
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets | 16,211 | 13,866
Significant Other Observable Inputs (Level 2) |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets |  |
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets |  |
Significant Unobservable Inputs (Level 3) |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets |  |
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Presentation of fair value of financial assets using the inputs |  |
Total financial assets |  |

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- 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

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- Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration