Quarterly report pursuant to Section 13 or 15(d)

Accrued Warranty - Additional Information (Details)

v3.21.2
Accrued Warranty - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Product Warranty Liability [Line Items]      
Accrued warranty (Note 8) $ 195 $ 204 $ 234
Catheters [Member] | Product Recall [Member]      
Product Warranty Liability [Line Items]      
Accrued warranty (Note 8) $ 100 $ 100