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Wind-Down Expenses (Details) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended
Wind-Down Expenses (Details) (USD $)	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Summary of changes to our wind-down reserve
Accrued wind-down reserve at beginning of period		$ 1,148,000	$ 1,418,000			$ 1,683,000	$ 2,644,000
Less actual expenses recorded against estimated reserve during the period	(284,000)	(280,000)	(300,000)	(864,000)		(1,248,000)
Additional expense recorded to revise estimated reserve at period-end	155,000	10,000	35,000	200,000		287,000
Revised reserve at period-end	1,019,000	1,148,000	1,418,000	1,019,000		1,683,000
Add deferred rent at period-end	299,000	350,000	401,000	(69,997)	(1,034,088)	452,000
Total accrued wind-down expenses at period-end (current and non-current)	1,318,000	1,498,000	1,819,000	1,318,000		2,135,000
Accrued wind-down expenses, current	1,318,000	1,498,000	1,428,000	1,318,000		1,361,000
Accrued wind-down expenses, non-current			$ 391,000			$ 774,000