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The Company and Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Aug. 28, 2019
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Gigabit / s
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
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 20            
Maximum specific allowance as percentage of invoice value for problematic customer balances       100.00%      
Allowance for doubtful accounts receivable     $ 0 $ 0 $ 0    
Inventory reserves       100,000 100,000 $ 300,000  
Impairment of goodwill   $ 400,000 12,900,000 420,000 12,856,000    
Goodwill balance   $ 0 420,000   420,000    
Accumulated deficit     (235,867,000) $ (238,447,000) (235,867,000) (224,688,000)  
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       $ 300,000      
Period payments due from customers       60 days      
Revenue, practical expedient, financing component       true      
Right-of-use lease asset       $ 156,000     $ 400,000
Lease liabilities       $ 166,000     $ 400,000
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