Note 3 - Balance Sheet Detail - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued payroll and related expenses	$ 14,341	$ 9,377
Sales and marketing accruals	2,527	2,379
Accrued sales tax	3,922	2,935
Warranty liability	4,401	4,666
Other accrued liabilities	5,116	3,943
Total	$ 30,307	$ 23,300