Accrued liabilities components (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accrued Liabilities Components Details
Bonuses	$ 1,150	$ 889
Payroll and payroll taxes	353	322
Compensated absences	357	336
Deferred rent credit	146	134
Warranty	239	35
Adverse purchase commitments	500	500
Professional fees	57	78
Other	597	435
Accrued liabilities	$ 3,399	$ 2,729