Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.19.3
Commitments and Contingencies (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue | Customer concentration        
Certain Risks and Concentrations        
Concentration Risk, Percentage 59.00% 71.00% 71.00% 70.00%