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Property and Equipment (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Property and Equipment    
Property and equipment, gross $ 22,311,000 $ 19,531,000
Less accumulated depreciation (12,495,000) (13,353,000)
Property and equipment, net 9,816,000 6,178,000
Depreciation expense for capital lease obligation 200,000  
Capital lease obligations outstanding   0
Computer equipment    
Property and Equipment    
Property and equipment, gross 3,511,000 5,075,000
Computer software    
Property and Equipment    
Property and equipment, gross 1,347,000 1,354,000
Research equipment    
Property and Equipment    
Property and equipment, gross 7,465,000 6,483,000
Furniture and fixtures    
Property and Equipment    
Property and equipment, gross 3,018,000 2,444,000
Leasehold improvements    
Property and Equipment    
Property and equipment, gross $ 6,970,000 $ 4,175,000