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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 | 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 shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares
Net loss |  |  |  | $ (1,743,000) | $ (4,701,000) | $ (10,142,000) | $ (17,570,000) | $ 32,000,000 | $ 31,500,000 | $ (32,682,000)
Accumulated deficit |  |  |  | $ (224,162,000) |  | (224,162,000) |  | (214,020,000) | $ (181,972,000) |
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 |
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 |  |
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 |  |  |  |  |  | 248,000 | 558,000 |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |  |  |
Per Share Amounts |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  |  | 47,000 |  |  |
RSU's |  |  |  |  |  |  |  |  |  |
Per Share Amounts |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  | 385,000 | 150,000 |  |  |
Convertible debt |  |  |  |  |  |  |  |  |  |
Per Share Amounts |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  | 1,021,000 | 926,000 |  |  |
Outstanding warrants |  |  |  |  |  |  |  |  |  |
Per Share Amounts |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  |  |  | 663,000 |  |  |  |
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 |  |  |  |  |  |  |

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