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Commitments and Contingencies (Summary of Pre-Acquisition Contingencies) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
CDC [Member]    
Assets    
Prepaid expenses and other current assets $ 2,212 $ 2,212
Other non-current assets 0 0
Liabilities    
Accrued expenses and other current liabilities 2,212 2,212
Other long-term liabilities 0 0
Network1 [Member]    
Assets    
Prepaid expenses and other current assets 1,294 1,294
Other non-current assets 8,235 8,235
Liabilities    
Accrued expenses and other current liabilities 1,294 1,294
Other long-term liabilities $ 8,235 $ 8,235