XML 74 R54.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Summary of Significant Accounting Policies - Warranty (Details)
12 Months Ended
Dec. 31, 2019
Minimum [Member]  
Product Liability Contingency [Line Items]  
Product Warranty Period 1 year
Maximum [Member]  
Product Liability Contingency [Line Items]  
Product Warranty Period 3 years