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Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments avail for sale securities levels 1-2-3 table (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Cash, Cash Equivalents, and Short-term Investments | $ 104,531 | $ 62,313
Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 65,708 | 38,891
Fair Value, Measurements, Recurring [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash, Cash Equivalents, and Short-term Investments | 65,708 | 38,891
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 65,708 | 38,891
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash, Cash Equivalents, and Short-term Investments | 65,708 | 38,891
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 65,708 | 38,891
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash, Cash Equivalents, and Short-term Investments | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash, Cash Equivalents, and Short-term Investments | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 0

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- Definition Cash, cash equivalents and short-term investments - fair value disclosure + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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