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