Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Concentrations (Details)

v3.19.3.a.u2
Summary of Significant Accounting Policies - Concentrations (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Skyhook | Significant customer | Revenue | Customer concentration      
Concentration Risk [Line Items]      
Customer concentration (as a percent) 58.00% 66.00% 57.00%