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Acquisition - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 5 Months Ended 12 Months Ended
Aug. 02, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Long-term debt   $ 6,069 $ 6,069 $ 6,069 $ 0  
Restructuring   439   1,920 $ 2,608 $ 0
Acquisition-related costs excluded from pro forma       3,010    
Gain recognized on the sale of a product line       $ 4,785    
ViXS Systems, Inc.            
Business Acquisition [Line Items]            
Percent of outstanding shares acquired 100.00%          
Shares issued per acquired share (in shares) 0.04836     0.04836    
Purchase price $ 16,975          
Integration related costs 1,115          
Severance pay $ 800          
Period of severance payments 24 months          
Cost of accelerated vesting of restricted stock units $ 315          
Inventory 3,175          
Revaluation adjustment to inventory   (386)        
Revaluation adjustment to goodwill   $ 386        
Deferred tax assets 62,992          
Valuation allowance 62,972          
Revenue of acquiree since acquisition date, actual     4,489      
Net income (loss) of acquiree since acquisition date, actual     (6,729)      
Restructuring     1,920      
Amortization     $ 3,633      
ViXS Systems, Inc. | Fair Value Adjustment to Inventory            
Business Acquisition [Line Items]            
Inventory 2,191          
ViXS Systems, Inc. | Developed technology            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired $ 5,050          
Weighted average useful life 5 years          
ViXS Systems, Inc. | Customer relationships            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired $ 1,270          
Weighted average useful life 3 years          
ViXS Systems, Inc. | Backlog and tradename            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired $ 410          
Weighted average useful life 2 years          
ViXS Systems, Inc. | Convertible Debt            
Business Acquisition [Line Items]            
Long-term debt $ 4,762          
Principal amount 6,068          
Unamortized discount 1,306          
Debt conversion feature $ 1,723          
ViXS Systems, Inc. | Holder of ViXS Restricted Stock, Vested at Closing            
Business Acquisition [Line Items]            
Stock issued due to acquisition (in shares) 122,242          
ViXS Systems, Inc. | Restricted Stock Units (RSUs)            
Business Acquisition [Line Items]            
Value of shares issued $ 659          
Stock issued due to acquisition (in shares) 202,043          
ViXS Systems, Inc. | Common Stock            
Business Acquisition [Line Items]            
Value of shares issued $ 16,316          
Stock issued due to acquisition (in shares) 3,586,021