Segment and Geographical Information (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Summary of Revenue by Geographical Region
 Mobility Services
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016

2015
 
2016
 
2015
United States
43
%

43
%
 
43
%
 
40
%
EMEA
44
%

48
%
 
44
%
 
50
%
Asia Pacific
11
%

8
%
 
12
%
 
9
%
Rest of the World
2
%

1
%
 
1
%
 
1
%