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Commitments and Contingencies (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases          
2018     $ 2,546,000    
2019     2,726,000    
2020     2,388,000    
2021     1,980,000    
2022     1,406,000    
Net rent expense     $ 1,700,000 $ 638,000 $ 558,000
Monrovia          
Lease term 64 months        
Renewal term 5 years        
San Diego          
Lease term   61 months      
Renewal term   5 years