Annual report pursuant to Section 13 and 15(d)

Accrued Warranty - Additional Information (Details)

v3.20.4
Accrued Warranty - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Product Warranty Liability [Line Items]      
Warranty expense $ 100,000 $ 900,000  
Accrued warranty (Note 7) 242,000 338,000 $ 112,000
Catheters [Member] | Product Recall [Member]      
Product Warranty Liability [Line Items]      
Accrued warranty (Note 7) $ 100,000 $ 200,000