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Fair Value Measurements Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 5,033 $ 4,264 $ 0
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Convertible Debt, Fair Value Disclosures 129,900 143,500  
Other Debts, excluding capital leases 21,800 $ 19,300  
TVN Voluntary Departure Plan [Member] | Harmonic 2016 Restructuring Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Voluntary Departure Plan, Liability [1] $ 5,128    
[1] The current portion and long-term portion of the restructuring liability are reported under “Accrued and other current liabilities” and “Other non-current liabilities”, respectively, on the Company’s Consolidated Balance Sheets.