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Commitments and Contingencies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  |  | $ 1,795,000 | $ 1,926,000 | $ 1,523,000
Other | $ 0 | $ 0 | $ (1,242,000) | $ 1,742,000 | $ 250,000 | $ 3,465,000 | $ 0 | $ 426,000 | 500,000 | 4,141,000 | $ 1,548,000
Partners' capital, authorized | 250,000,000 |  |  |  |  |  |  |  | 250,000,000 |  |
Cash and other assets, IP Fund | 1,118,000 |  |  |  | 7,740,000 |  |  |  | 1,118,000 | 7,740,000 |
Patents, net of accumulated amortization, IP Fund | 0 |  |  |  | 147,000 |  |  |  | 0 | 147,000 |
Investments, IP Fund | 2,933,000 |  |  |  | 5,829,000 |  |  |  | 2,933,000 | 5,829,000 |
Total assets, IP Fund | 4,051,000 |  |  |  | 13,716,000 |  |  |  | 4,051,000 | 13,716,000 |
Accrued expenses and contributions, IP Fund | 2,394,000 |  |  |  | 7,436,000 |  |  |  | 2,394,000 | 7,436,000 |
Net assets, IP Fund | $ 1,657,000 |  |  |  | $ 6,280,000 |  |  |  | 1,657,000 | 6,280,000 |
Revenues, IP Fund |  |  |  |  |  |  |  |  | 16,000 | 18,000 |
IP Fund, Operating expenses |  |  |  |  |  |  |  |  | 572,000 | 1,617,000 |
IP Fund, Gain from Operations |  |  |  |  |  |  |  |  | (556,000) | (1,599,000) |
IP Fund, Net Loss in Equity Method Investment |  |  |  |  |  |  |  |  | (1,013,000) | 6,922,000 |
IP Fund, Net Loss |  |  |  |  |  |  |  |  | $ (1,569,000) | $ 5,323,000 |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  |  |  | 1.15% |  |

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