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Commitments and Contingencies (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 28, 2015
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leases          
2016     $ 679,000    
2017     699,000    
2018     602,000    
2019     581,000    
2020     299,000    
Net rent expense     $ 558,000 $ 597,000 $ 547,000
Monrovia          
Renewal term   5 years      
San Diego          
Renewal term 1 year