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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  |  | $ 1,926,000 | $ 1,523,000 |  | $ 1,312,000
Other | $ 250,000 | $ 3,465,000 | $ 0 | $ 426,000 | $ 0 | $ 1,548,000 | $ 0 | $ 0 | 4,141,000 | 1,548,000 | $ 3,506,000 |
Partners' capital, authorized | 250,000,000 |  |  |  |  |  |  |  | 250,000,000 |  |  |
Cash and other assets, IP Fund | 7,740,000 |  |  |  | 2,823,000 |  |  |  | 7,740,000 | 2,823,000 |  |
Patents, net of accumulated amortization, IP Fund | 147,000 |  |  |  | 967,000 |  |  |  | 147,000 | 967,000 |  |
Investments, IP Fund | 5,829,000 |  |  |  | 8,281,000 |  |  |  | 5,829,000 | 8,281,000 |  |
Total assets, IP Fund | 13,716,000 |  |  |  | 12,071,000 |  |  |  | 13,716,000 | 12,071,000 |  |
Accrued expenses and contributions, IP Fund | 7,436,000 |  |  |  | 1,876,000 |  |  |  | 7,436,000 | 1,876,000 |  |
Total liabilities, IP Fund | 7,436,000 |  |  |  | 1,876,000 |  |  |  | 7,436,000 | 1,876,000 |  |
Net assets, IP Fund | $ 6,280,000 |  |  |  | $ 10,195,000 |  |  |  | 6,280,000 | 10,195,000 |  |
Revenues, IP Fund |  |  |  |  |  |  |  |  | 18,000 | 1,560,000 |  |
IP Fund, Operating expenses |  |  |  |  |  |  |  |  | 1,617,000 | 1,724,000 |  |
IP Fund, Gain from Operations |  |  |  |  |  |  |  |  | (1,599,000) | (164,000) |  |
IP Fund, Net Loss in Equity Method Investment |  |  |  |  |  |  |  |  | 6,922,000 | (1,807,000) |  |
IP Fund, Net Loss |  |  |  |  |  |  |  |  | $ 5,323,000 | $ (1,971,000) |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  |  | 1.15% |  |  |

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