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Property and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property And Equipment Details    
Production equipment $ 6,573 $ 4,580
Leasehold improvements 601 494
Computer hardware and software/lab equipment 5,515 4,968
Office furniture and equipment 1,304 1,096
Property and equipment, gross 13,993 11,138
Less: Accumulated depreciation (10,742) (9,601)
Property and equipment, net $ 3,251 $ 1,537