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Stockholders' Equity - Grants and Expense (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 08, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Common Stock, Shares Authorized |  | 62,500,000 |  | 62,500,000 |  |
Preferred Stock, Shares Authorized |  | 2,000,000 |  | 2,000,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 316,000 |  | $ 316,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 259,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  | $ 131,000 |  | $ 131,000 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1.80 |  | $ 1.80 |  |
Warrants Intrinsic Value Outstanding |  | $ 0 |  | $ 0 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 80,000 |  | 80,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  | 1,150,375 |  | 1,150,375 |  | 587,962
Stock Issued During Period In Lieu of Cash Bonus |  |  |  |  |  | 159,100
Warrants and Rights Remaining Term |  |  |  | 1 year 4 months 21 days |  |
Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 146,000 |  | $ 146,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  | 10 years |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | $ 2.25 |  |
Allocated Share-based Compensation Expense |  | $ 24,000 |  | $ 183,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1 |  |  |  | 2 years |  |
Incentive Stock Options [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 1.16 |  |
Consultant Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 253,367 |  | 253,367 |  |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  |  |  | 1.00% |  |
Consultant Plan Expenses |  | $ 4,000 | $ 9,000 | $ 11,000 | $ 26,000 |
Shares Reserved Unissued |  | 192,617 |  | 192,617 |  |
Consultant Plan [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 329,000 |  |
Consultant Plan Two [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 10,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 1.44 |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Value Grants In Period Weighted Average Grant Date Fair Value |  |  |  | $ 14,000 |  |
2011 Equity Incentive Plan [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 258,618 |  |
Non-Qualified Stock Option [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 341,382 |  |
Equity Incentive Plan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 1,231,593 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 4,004,214 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum | 15.00% |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 4,004,589 |  | 4,004,589 |  |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  |  |  | 15.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 1,298,718 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  | 10 years |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1 |  | $ 1 |  |
Allocated Share-based Compensation Expense |  | $ 58,000 | 59,000 | $ 274,000 | 170,000 |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  | 2,115,670 |  | 2,115,670 |  | 880,277
Shares Reserved Unissued |  | 1,297,040 |  | 1,297,040 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1 |  |  |  | 1 year 8 months 12 days |  |
Equity Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 0.87 |  |
Equity Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 2.25 |  |
Equity Incentive Plan [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Estimated common stock subject to options issued |  |  |  | 381,000 |  |
Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 258,618 |  |
Equity Incentive Plan [Member] | Director [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 381,000 |  |
Equity Incentive Plan [Member] | Other Employees [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 500,000 |  |
Equity Incentive Plan [Member] | Board of Directors [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 34,000 |  | $ 34,000 |  |
Equity Incentive Plan [Member] | Board of Directors [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | $ 34,000 | $ 0 | $ 103,000 | $ 0 |

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