Note 4 - Balance Sheet Details - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued payroll and related expenses	$ 10,869	$ 9,036
Sales and marketing programs	3,060	706
Warranty liability	2,940	2,461
Sales tax	2,206	2,373
Other	3,128	2,821
Total	$ 22,203	$ 17,397