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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value $ 55,000 $ 16,087,000  
Total liabilities measured and recorded at fair value 4,000 9,690,000  
Accrued TVN VDP, long-term portion 4,999,000 4,237,000  
Assets, Fair Value Disclosure, Nonrecurring 0 0 $ 0
Liabilities, Fair Value Disclosure, Nonrecurring 0 0 $ 0
Cash equivalents [Member] | Money market funds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 22,000 8,301,000  
Short-term investments [Member] | Corporate bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value   6,923,000  
Prepaid Expenses and Other Current Assets [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 33,000 54,000  
Accrued and Other Current Liabilities [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total liabilities measured and recorded at fair value 4,000 40,000  
Cost-method Investments [Member] | Equity Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value   809,000  
Level 1 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 22,000 9,110,000  
Total liabilities measured and recorded at fair value 0 0  
Level 1 [Member] | Cash equivalents [Member] | Money market funds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 22,000 8,301,000  
Level 1 [Member] | Short-term investments [Member] | Corporate bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value   0  
Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 0 0  
Level 1 [Member] | Accrued and Other Current Liabilities [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total liabilities measured and recorded at fair value 0 0  
Level 1 [Member] | Cost-method Investments [Member] | Equity Securities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value   809,000  
Level 2 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 33,000 6,977,000  
Total liabilities measured and recorded at fair value 4,000 40,000  
Level 2 [Member] | Cash equivalents [Member] | Money market funds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 0 0  
Level 2 [Member] | Short-term investments [Member] | Corporate bonds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value   6,923,000  
Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value 33,000 54,000  
Level 2 [Member] | Accrued and Other Current Liabilities [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total liabilities measured and recorded at fair value 4,000 40,000  
Level 3 [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value [1] 0    
Total liabilities measured and recorded at fair value 0 [1] 9,650,000 [2]  
Level 3 [Member] | Cash equivalents [Member] | Money market funds [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value [1] 0    
Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total assets measured and recorded at fair value [1] 0    
Level 3 [Member] | Accrued and Other Current Liabilities [Member] | Foreign exchange forward contracts [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Total liabilities measured and recorded at fair value 0 [1] 0 [2]  
TVN Voluntary Departure Plan [Member] | Accrued and Other Current Liabilities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Accrued TVN VDP, current portion   6,597,000  
TVN Voluntary Departure Plan [Member] | Other non-current liabilities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Accrued TVN VDP, long-term portion   3,053,000  
TVN Voluntary Departure Plan [Member] | Level 3 [Member] | Accrued and Other Current Liabilities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Accrued TVN VDP, current portion [2]   6,597,000  
TVN Voluntary Departure Plan [Member] | Level 3 [Member] | Other non-current liabilities [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Accrued TVN VDP, long-term portion [2]   $ 3,053,000  
TVN Voluntary Departure Plan [Member] | Harmonic 2016 Restructuring Plan [Member]      
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]      
Accrued TVN VDP, current portion [3] $ 5,128,000    
[1] The Company’s liability for the TVN VDP at December 31, 2017 was $5.1 million. This amount is not included in the table above because its fair value at inception, based on Level 3 inputs, was determined during the fourth quarter of fiscal 2016. Subsequently there is no recurring fair value remeasurement for this liability based on the applicable accounting guidance.
[2] The Company’s liability for the TVN VDP is classified within Level 3 because discount rates which are unobservable in the market were being used to measure the fair value of this liability during the fourth quarter of fiscal 2016.
[3] 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.