CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Sales
Total sales	$ 3,381	$ 1,533	$ 6,016	$ 3,042
Cost of sales
Total cost of sales	1,937	1,698	3,417	3,123
Gross margin	1,444	(165)	2,599	(81)
Operating Expenses:
Research and development	5,331	7,265	10,792	15,599
General and administrative	5,306	12,012	11,488	23,372
Sales and marketing	2,499	3,750	5,046	7,911
Total operating expenses	13,136	23,027	27,326	46,882
Loss from operations	(11,692)	(23,192)	(24,727)	(46,963)
Interest income	1,030	32	1,899	33
Other income (expense), net	25	1	31	(4)
Loss before provision for income taxes	(10,637)	(23,159)	(22,797)	(46,934)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	$ (10,637)	$ (23,159)	$ (22,797)	$ (46,934)
Earnings Per Share, Basic	$ (0.15)	$ (0.33)	$ (0.32)	$ (0.67)
Earnings Per Share, Diluted	$ (0.15)	$ (0.33)	$ (0.32)	$ (0.67)
Denominator for Basic EPS - Weighted-average common stock	71,201,170	70,350,178	71,033,629	70,341,411
Denominator for Dilutive EPS - Weighted-average common stock	71,201,170	70,350,178	71,033,629	70,341,411
Device
Sales
Total sales	$ 2,810	$ 1,168	$ 4,942	$ 2,360
Cost of sales
Total cost of sales	1,549	1,259	2,620	2,296
Service
Sales
Total sales	571	365	1,074	682
Cost of sales
Total cost of sales	$ 388	$ 439	$ 797	$ 827