Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.19.2
Commitments and Contingencies (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue | Customer concentration        
Certain Risks and Concentrations        
Concentration Risk, Percentage 70.00% 72.00% 72.00% 67.00%