Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Skyhook - Indemnification claim
$ in Thousands
Sep. 30, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
General Litigation    
Number of claims | item 4  
Loss Contingency Accrual | $ $ 0 $ 0