Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Schedule of Warranty) (Details)

v3.21.1
Summary of Significant Accounting Policies (Schedule of Warranty) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies [Abstract]    
Beginning balance $ 513 $ 554
Amounts charged to expense 59 10
Actual warranty costs paid (67) (51)
Ending balance $ 505 $ 513