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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Future minimum lease payments under non-cancelable operating leases      
2016 $ 888,000    
2017 376,000    
Total minimum lease payments 1,264,000    
Minimum sublease rentals due in the future under noncancelable subleases 314,000    
Rent expense $ 1,200,000 $ 1,800,000 $ 2,000,000