Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Geographical regions (Details)

v3.19.3
Summary of Significant Accounting Policies - Geographical regions (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Concentration Risk, Percentage 80.00%        
North America [Member]          
Concentration Risk, Percentage   86.00% 84.00% 78.00% 81.00%
Asia-Pacific [Member]          
Concentration Risk, Percentage     11.00%   15.00%
Europe [Member]          
Concentration Risk, Percentage       15.00%