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Property and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property And Equipment Details    
Production equipment $ 4,150 $ 3,078
Leasehold improvements 494 494
Computer hardware and software/lab equipment 4,618 4,486
Office furniture and equipment 1,087 1,087
Property and equipment, gross 10,349 9,145
Less: Accumulated depreciation (8,680) (8,251)
Property and equipment, net $ 1,669 $ 894