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Property and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property And Equipment Details    
Production equipment $ 4,580 $ 4,150
Leasehold improvements 494 494
Computer hardware and software/lab equipment 4,968 4,618
Office furniture and equipment 1,096 1,087
Property and equipment, gross 11,138 10,349
Less: Accumulated depreciation (9,601) (8,680)
Property and equipment, net $ 1,537 $ 1,669