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Employee Benefit Plans - Pension Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retirement Benefits [Abstract]      
Defined Benefit Plan, Benefit Obligation $ 5,033 $ 4,264 $ 0
Acquired from TVN acquisition 0 5,907  
Service cost 259 217  
Interest cost 71 87  
Actuarial (gains) losses (528) 279  
Curtailment [1] 0 (1,955)  
Adjustment for prior year balance 343 0  
Foreign currency translation adjustment 624 (271)  
Current portion (presented under “Accrued and other current liabilities”) 34 27  
Long-term portion (presented under “Other non-current liabilities”) $ 4,999 $ 4,237  
[1] As a result of the TVN VDP, the defined benefit pension plan was remeasured in the fourth quarter of 2016, which resulted in a non-cash curtailment gain of $2.0 million. The curtailment gain was recognized in the Consolidated Statement of Operations during the fourth quarter of 2016 and the Company’s pension liability was reduced by the same amount. Of the $2.0 million pension curtailment gain, $0.6 million is included in product cost of revenue and the remaining $1.4 million is included in operating expenses-restructuring and related charges in the Consolidated Statement of Operations. The remeasurement did not have a material effect on other components of net periodic pension expense for the year ended December 31, 2016.