Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Summary of Significant Accounting Policies (Schedule of Warranty) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]    
Beginning balance $ 554 $ 543
Amounts charged to expense 10 97
Actual warranty costs paid (51) (86)
Ending balance $ 513 $ 554