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The Company and Summary of Significant Accounting Policies - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2017
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Gigabit / s
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Oct. 04, 2018
$ / shares
Summary Of Significant Accounting Policies [Line Items]                
Speed per second of high-speed interface technology of Bandwidth Engine ICs (in giga per second) | Gigabit / s         10      
Reverse stock split 10              
Common stock, par or stated value per share | $ / shares $ 0.001 $ 0.001     $ 0.001 $ 0.001   $ 0.001
Maximum specific allowance as percentage of invoice value for problematic customer balances   100.00%     100.00%      
Allowance for doubtful accounts receivable   $ 0     $ 0 $ 0    
Inventory reserves         100,000 300,000 $ 0  
Impairment of goodwill   9,700,000 $ 3,200,000 $ 9,900,000 12,856,000   $ 9,858,000  
Accumulated deficit   $ (235,867,000)     $ (235,867,000) (224,688,000)    
Period payments due from customers         60 days      
Revenue, practical expedient, financing component         true      
Payment terms         The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically 60 days or less      
Deferred revenue, revenue recognized         $ 3,900,000      
Remaining term of the lease at the time of adoption   22 months     22 months      
Adjustments Due to ASC 606 | ASU 2014-09                
Summary Of Significant Accounting Policies [Line Items]                
Accumulated deficit   $ (220,000)     $ (220,000) $ 230,000    
Minimum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful lives of property and equipment         3 years      
Estimated useful lives of long-lived assets         3 years      
Maximum                
Summary Of Significant Accounting Policies [Line Items]                
Estimated useful lives of property and equipment         5 years      
Estimated useful lives of long-lived assets         7 years