Note 3 - Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accrued salary and payroll-related expenses	$ 2,454	$ 3,695
Deferred strategic agreement revenues	1,463	934
Finance lease liabilities	1,103	1,249
Accrued liabilities	1,033	866
Income taxes payable	867	883
Sales and use tax payable	50	244
Deferred rent		538
Other	828	932
Total accrued expenses and other current liabilities	8,966	10,632	[1]
Advance Billings [Member]
Contract with customer liability	697	859
Customer Advance [Member]
Contract with customer liability	$ 471	$ 432

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.