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Wind-Down and Exit Costs - Components of Wind-Down Reserve (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]        
Accrued wind-down reserve at beginning of period       $ 854,000
Less actual expenses recorded against estimated reserve during the period 916,000      
Revised reserve at period-end       854,000
Add deferred rent at period end (435,967) (85,572) (1,302,543)  
Facility Closing In Rhode Island [Member]
        
Restructuring Cost and Reserve [Line Items]        
Accrued wind-down reserve at beginning of period 854,000 1,683,000    
Less actual expenses recorded against estimated reserve during the period (916,000) (1,185,000)    
Additional expense recorded to revise estimated reserve 62,000 356,000    
Revised reserve at period-end    854,000    
Add deferred rent at period end    249,000    
Total accrued wind-down expenses at period-end (current)    $ 1,103,000