Quarterly report pursuant to Section 13 or 15(d)

Revenues - Additional Information (Details)

v3.10.0.1
Revenues - Additional Information (Details)
6 Months Ended
Jun. 30, 2018
Disaggregation of Revenue [Line Items]  
Contract period (or less) 1 year
Activation fee revenue recognition period 1 month
Minimum  
Disaggregation of Revenue [Line Items]  
Data trial contract period 3 years
Maximum  
Disaggregation of Revenue [Line Items]  
Percent of deferred revenue related to long-term contracts 10.00%
Data trial contract period 5 years
Subscription prepayment period 3 years
Prepaid Vehicle Subscriptions [Member] | Minimum  
Disaggregation of Revenue [Line Items]  
Contract period (or less) 3 months
Prepaid Vehicle Subscriptions [Member] | Maximum  
Disaggregation of Revenue [Line Items]  
Contract period (or less) 12 months