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Cash and Cash Equivalents, Short-term Investments and Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2014
Cash and Cash Equivalents [Abstract] |
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] | Cash and cash equivalents consist of the following significant asset investment classes as of March 31, 2014 and December 31, 2013 (in thousands):
| March 31, 2014 |
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash / Cash Equivalents |  | Security Classification
Cash | $ | 52,906 |  |  | $ | — |  |  | $ | — |  |  | $ | 52,906 |  |  | $ | 52,906 |  |  | N/A
Money market fund | 54,652 |  |  | — |  |  | — |  |  | 54,652 |  |  | 54,652 |  |  | Available for sale
Total cash and cash equivalents | $ | 107,558 |  |  | $ | — |  |  | $ | — |  |  | $ | 107,558 |  |  | $ | 107,558 |  |  |
c | December 31, 2013 |
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash / Cash Equivalents |  | Security Classification
Cash | $ | 38,823 |  |  | $ | — |  |  | $ | — |  |  | $ | 38,823 |  |  | $ | 38,823 |  |  | N/A
Money market fund | 65,708 |  |  | — |  |  | — |  |  | 65,708 |  |  | 65,708 |  |  | Available for sale
Total cash and cash equivalents | $ | 104,531 |  |  | $ | — |  |  | $ | — |  |  | $ | 104,531 |  |  | $ | 104,531 |  |  |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] | The following table shows our financial assets measured at fair value, on a recurring basis, with money market funds recorded within cash and cash equivalents (in thousands):
| Quoted Prices in Active Markets for Identical Instruments (Level 1) |  | Total Fair Value
Money market fund at March 31, 2014 | $ | 54,652 |  |  | $ | 54,652 |
Money market fund at December 31, 2013 | $ | 65,708 |  |  | $ | 65,708 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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