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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property and Equipment      
Property and equipment, gross $ 21,577 $ 22,311  
Less accumulated depreciation (12,515) (12,495)  
Property and equipment, net 9,062 9,816  
Depreciation 3,593 3,242 $ 1,833
Computer equipment      
Property and Equipment      
Property and equipment, gross 3,746 3,511  
Computer software      
Property and Equipment      
Property and equipment, gross 1,236 1,347  
Research equipment      
Property and Equipment      
Property and equipment, gross 6,379 7,465  
Furniture and fixtures      
Property and Equipment      
Property and equipment, gross 2,992 3,018  
Leasehold improvements      
Property and Equipment      
Property and equipment, gross 7,193 $ 6,970  
Construction in progress      
Property and Equipment      
Property and equipment, gross $ 31