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Lease Exit Liability - Changes in Lease Exit Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 16, 2008
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Amount of immaterial error correction   $ 1,900  
Series D Convertible Preferred Stock [Member]      
Restructuring Cost and Reserve [Line Items]      
Shares issued in connection with acquisition 12,466,039    
Contract Termination [Member]      
Restructuring Cost and Reserve [Line Items]      
Accrual Beginning Balance   8,006 $ 9,445
Principal payments   (3,293) (1,439)
Accrual Ending Balance   $ 4,713 $ 8,006