CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Sales
Total sales	$ 2,330	$ 2,348	$ 8,346	$ 5,390
Cost of sales
Total cost of sales	1,206	1,660	4,623	4,783
Gross margin	1,124	688	3,723	607
Operating Expenses:
Research and development	5,739	7,338	16,531	22,937
General and administrative	4,615	3,198	16,103	26,570
Sales and marketing	2,529	3,434	7,575	11,345
Total operating expenses	12,883	13,970	40,209	60,852
Loss from operations	(11,759)	(13,282)	(36,486)	(60,245)
Interest income	1,021	170	2,920	203
Other income (expense), net	(19)	(59)	12	(63)
Loss before provision for income taxes	(10,757)	(13,171)	(33,554)	(60,105)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	$ (10,757)	$ (13,171)	$ (33,554)	$ (60,105)
Earnings Per Share, Basic	$ (0.15)	$ (0.19)	$ (0.47)	$ (0.85)
Earnings Per Share, Diluted	$ (0.15)	$ (0.19)	$ (0.47)	$ (0.85)
Denominator for Basic EPS - Weighted-average common stock	71,464,315	70,509,639	71,178,769	70,398,103
Denominator for Dilutive EPS - Weighted-average common stock	71,464,315	70,509,639	71,178,769	70,398,103
Device
Sales
Total sales	$ 1,728	$ 1,945	$ 6,670	$ 4,305
Cost of sales
Total cost of sales	835	1,215	3,321	3,511
Service
Sales
Total sales	602	403	1,676	1,085
Cost of sales
Total cost of sales	$ 371	$ 445	$ 1,302	$ 1,272