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The Company and Summary of Significant Accounting Policies (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 16, 2017
$ / shares
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 ($)
shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Net loss       $ (1,743,000) $ (4,701,000) $ (10,142,000) $ (17,570,000) $ 32,000,000 $ 31,500,000
Accumulated deficit       $ (224,162,000)   (224,162,000)   $ (214,020,000)  
Interest payments in-kind through the issuance of additional notes           $ 656,000 440,000    
Reverse stock split 10                
Common Stock, Par or Stated Value Per Share | $ / shares $ 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       0 $ 0 $ 0 $ 0    
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      
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           2,317 1,681    
Options                  
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           248 558    
Employee stock purchase plan                  
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares             47    
RSU's                  
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           385 150    
Convertible debt                  
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           1,021 926    
Outstanding warrants                  
Per Share Amounts                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares           663      
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           $ 1,200,000      
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments   $ 5,000,000 $ 5,000,000