XML 53 R40.htm IDEA: XBRL DOCUMENT v3.21.1
Business Description, Basis of Presentation and Significant Accounting Policies - Warranty Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Description, Basis of Presentation and Significant Accounting Policies    
Balance at the beginning of year $ 194 $ 194
Accruals/additions 119 121
Usage/claims (119) (121)
Balance at end of year $ 194 $ 194