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Commitments and Contingencies (Summary of Pre-Acquisition Contingencies) (Details) - Network1 [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Assets    
Prepaid expenses and other current assets $ 1,334 $ 1,385
Other non-current assets 5,488 5,700
Liabilities    
Accrued expenses and other current liabilities 1,334 1,385
Other long-term liabilities $ 5,488 $ 5,700