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The Company and Summary of Significant Accounting Policies (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2017
$ / shares
Feb. 14, 2017
Mar. 14, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
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             $ 656,000 $ 440,000 $ 650,000    
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%   100.00%    
Allowance for doubtful accounts receivable         $ 0   $ 0   $ 0 $ 0  
Inventory reserves         0 $ 0 $ 0 $ 0   300,000  
Impairment of goodwill                 $ 9,858,000    
Threshold purchase return percentage by distributors for slow, non-moving or obsolete inventory             10.00%   10.00%    
Specified period for return of threshold percentage of purchases by distributors for slow, non-moving or obsolete inventory             6 months   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             2,317,000 1,681,000 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% 10.00%              
Aggregate principal amount     $ 8,000,000 $ 8,000,000 $ 9,200,000   $ 9,200,000        
Interest payments in-kind through the issuance of additional notes     800,000       $ 1,200,000        
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments     $ 5,000,000 $ 5,000,000              
Minimum                      
Estimated useful lives                 3 years    
Life                 3 years    
Maximum                      
Estimated useful lives                 5 years    
Life                 7 years