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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Marketable Securities [Abstract] |
Summary of marketable securities |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 401 |  |  | $ | — |  |  | $ | — |  |  | $ | 401 |
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 10,500 |  |  | $ | 35 |  |  | $ | (50 | ) |  | $ | 10,485 |
Schedule of available-for-sale corporate debt securities |
|  | Fair Value |
|  | (in thousands) |
Within one year |  | $ | 401 |
After one year through five years |  |  | — |
After five years through ten years |  |  | — |
After ten years |  |  | — |
Total |  | $ | 401 |
Summary of Available-for-sale securities in unrealized loss position for other-than-temporary impairments |
|  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
December 31, 2012: |  |  |  |  |  |
Corporate debt securities |  | $ | 50 |  |  | $ | 2,500 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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