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 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
facility
Jun. 30, 2016
USD ($)
Leases        
Rental expense | $ $ 275 $ 304 $ 522 $ 555
Number of facilities | facility     2