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The Company and Summary of Significant Accounting Policies (Details)
 12 Months Ended
Feb. 16, 2017
$ / shares
Feb. 14, 2017
Mar. 14, 2016
USD ($)
Dec. 31, 2016
USD ($)
GB / s
item
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Number of IC product lines developed | item       2    
Speed per second of high-speed interface technology of Bandwidth Engine ICs (in gigabits) | GB / s       10    
Interest payments in-kind through the issuance of additional notes       $ 650,000    
Common Stock, Par or Stated Value Per Share | $ / shares       $ 0.001 $ 0.001  
Maximum specific allowance as percentage of invoice value for problematic customer balances       100.00%    
Allowance for doubtful accounts receivable       $ 0 $ 0  
Inventory reserves         300,000  
Impairment of goodwill       $ 9,858,000    
Threshold purchase return percentage by distributors for slow, non-moving or obsolete inventory       10.00%    
Specified period for return of threshold percentage of purchases by distributors for slow, non-moving or obsolete inventory       6 months    
Support and maintenance revenue recognition period       12 months    
Licensing revenue       $ 0 $ 0 $ 155,000
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       1,640 907 882
Options            
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       522,000 839,000 822,000
Employee stock purchase plan            
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       44,000 44,000 21,000
Unvested restricted common stock units            
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       148,000 24,000 39,000
Convertible debt            
Per Share Amounts            
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares       926,000    
Subsequent Event            
Reverse stock split 10 10        
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.001          
Senior Secured Convertible Notes due August 15 2018            
Stated interest rate (as a percent)     10.00%      
Aggregate principal amount     $ 8,000,000      
Interest payments in-kind through the issuance of additional notes     800,000      
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments     $ 5,000,000      
Minimum            
Estimated useful lives       3 years    
Life       3 years    
Maximum            
Estimated useful lives       5 years    
Life       7 years