Significant Market Segments And Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Significant market segments
Accounts receivable	$ 6,259	$ 5,913
Sales | International sales | Rest of World
Significant market segments
Direct sales percentage of sales	9.00%	10.00%
Sales | DaVita | Customer concentration
Significant market segments
Direct sales percentage of sales	46.00%	47.00%
Sales | Baxter | Customer concentration
Significant market segments
Direct sales percentage of sales	29.00%	26.00%
Sales | Nipro Medical Corporation | International sales | Rest of World
Significant market segments
Direct sales percentage of sales	7.00%	8.00%
Accounts receivable | DaVita
Significant market segments
Accounts receivable	$ 1,900	$ 1,000
Accounts receivable | Baxter
Significant market segments
Accounts receivable	$ 2,300	$ 3,500