Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Skyhook
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
facility
Sep. 30, 2016
USD ($)
Leases        
Rental expense | $ $ 368 $ 452 $ 890 $ 1,000
Number of facilities | facility     2