Note 2 - Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Property Plant and Equipment Useful Life [Table Text Block]

Operating lease assets – Senhance System leasing (in years)	5
Machinery, manufacturing and demonstration equipment (in years)	3	-	5
Computer equipment (in years)	3
Furniture (in years)	5
Leasehold improvements	Lesser of lease term or 3 to 10 years
Purchased Software	5

Disaggregation of Revenue [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
U.S.
Systems	$	78	$	101	$	262	$	176
Instruments and accessories		60		82		201		149
Services		105		106		307		278
Total U.S. revenue		243		289		770		603
Outside of U.S. ("OUS")
Systems		1,332		131		2,762		257
Instruments and accessories		706		122		1,351		410
Services		290		272		873		798
Total OUS revenue		2,328		525		4,986		1,465
Total
Systems		1,410		232		3,024		433
Instruments and accessories		766		204		1,552		559
Services		395		378		1,180		1,076
Total revenue	$	2,571	$	814	$	5,756	$	2,068