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%