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Wind-Down and Exit Costs (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of changes to our wind-down reserve      
Add deferred rent at period end $ (85,572) $ (1,302,543) $ 129,764
Facility Closing In Rhode Island [Member]
      
Summary of changes to our wind-down reserve      
Accrued wind-down reserve at beginning of period   1,683,000 2,644,000
Less actual expenses recorded against estimated reserve during the period (1,185,000) (1,248,000)  
Additional expense recorded to revise estimated reserve at period-end 356,000 287,000  
Revised reserve at period-end 854,000 1,683,000  
Add deferred rent at period end 249,000 452,000  
Total accrued wind-down expenses at period-end (current and non current) 1,103,000 2,135,000  
Accrued wind-down expenses, current portion 1,103,000 1,361,000  
Accrued wind-down expenses, non-current    $ 774,000