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Fair Value Measurements - Hierarchy (Details) - USD ($)
$ in Thousands
Aug. 03, 2015
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurements      
Operating cash balances   $ 9,450 $ 18,303
TVN      
Fair Value Measurements      
Period following closing date during which additional payments may be required 2 years    
Recurring      
Fair Value Measurements      
Money market funds   33,710 41,584
Contingent consideration on acquisition liability   2,483 1,430
Recurring | Level 1      
Fair Value Measurements      
Money market funds   33,710 41,584
Recurring | Level 3      
Fair Value Measurements      
Contingent consideration on acquisition liability   $ 2,483 $ 1,430