Note 5 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accrued bonuses	$ 728		$ 837
Accrued interest	704		683
Deferred revenue - subscription rental program	579
Accrued payroll and other related expenses	500		877
Accrued professional fees	494		978
Customer contracts liabilities	470		686
Accrued sales commission	423		1,743
Current operating lease liabilities	257	$ 230
Accrued clinical trial costs	166		84
Travel and entertainment	54		280
Accrued sales & use tax	9		259
Other accruals	73		339
Total accrued liabilities	$ 4,457	$ 6,996	$ 6,766	[1]

[1] The condensed consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date.