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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies [Abstract] |  |  |
Cash and other assets, IP Fund | $ 2,542,000 | $ 1,109,000 |
Patents, net of accumulated amortization, IP Fund | 7,144,000 | 4,277,000 |
Investments, IP Fund | 11,617,000 | 3,944,000 |
Total assets, IP Fund | 21,303,000 | 9,330,000 |
Accrued expenses and contributions, IP Fund | 5,016,000 | 4,495,000 |
Accrued patent acquisition costs, IP Fund | 500,000 | 500,000 |
Total liabilities, IP Fund | 5,516,000 | 4,995,000 |
Operating Leases, Rent Expense | 898,000 | 915,000 | 1,011,000
Partners Capital, Authorized |  | 250,000,000 |
Net Assets, Fund Related | $ 15,787,000 | $ 4,335,000 |

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- Definition Accrued expenses and contributions, IP Fund + References No definition available. + Details
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- Definition Accrued patent acquisition costs, IP Fund + References No definition available. + Details
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Balance Type: | credit
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- Definition Cash and other assets, IP Fund + References No definition available. + Details
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- Details
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- Definition Investments, IP Fund + References No definition available. + Details
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- Definition Fund net assets + References No definition available. + Details
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- Definition Authorized amount of capital to be raised by the fund. + References No definition available. + Details
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- Definition Patents, net of accumulated amortization, IP Fund + References No definition available. + Details
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- Definition Total assets, IP Fund + References No definition available. + Details
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- Definition Total liabilities, IP Fund + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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