XML 118 R98.htm IDEA: XBRL DOCUMENT v3.20.4
Geographic Concentrations - Additional Information (Details) - United States - Geographic Concentration Risk
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue      
Concentration Risk [Line Items]      
Concentration percentage 74.00% 78.00% 81.00%
Minimum | Property and Equipment      
Concentration Risk [Line Items]      
Concentration percentage 83.00% 83.00%