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Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2017 | Feb. 28, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 31, 2017 | Dec. 31, 2016
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 |  |  |
Share-Based Compensation |  |  |  |  | $ 284,000 | $ 492,000 |  |
Stock Option Plan Description |  |  |  |  | The Consultant Plan provides for quarterly increases in the available number of authorized shares equal to the lesser of 1% of any new shares issued by the Company during the quarter immediately prior to the adjustment date or such lesser amount as the Board of Directors shall determine. |  |  |
Proceeds From Issuance Or Sale Of Equity |  |  |  |  | $ 8,667,000 | 0 |  |
Common Stock, Repurchase Price Per Share |  | $ 0.0001 |  |  |  |  |  |
Stock Issued During Period 2017 Board Services Per Share |  | $ 3.60 |  |  | $ 3.60 |  |  |
General and Administrative Expenses To Be Recognized in Remainder of Year |  |  | $ 75,000 |  | $ 75,000 |  |  |
General and Administrative Expense |  |  | $ 1,131,000 | $ 2,840,000 | 3,569,000 | 5,342,000 |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | 9,600,000 |  |  |
Proceeds From Issuance Or Sale Of Equity |  |  |  |  | $ 8,700,000 |  |  |
Right Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number |  |  |  |  | 2,395,471 |  |  |
Stock Issued During Period, Shares, Other |  |  |  |  | 2,395,471 |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  | $ 4.00 |
General and Administrative Expense [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for 2017 Board Services |  |  |  |  | 300,000 |  |  |
General and Administrative Expense |  |  |  |  | $ 225,000 |  |  |
Consultant Plan [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 142,384 |  | 142,384 |  |  |
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 |  |  |  |  | $ 3.50 |  |  |
Shares Reserved Unissued |  |  | 101,634 |  | 101,634 |  |  |
Share Based Compensation Arrangement by Share Based Payment Award Options Grants In Period Fair Value |  |  |  |  | $ 35,000 |  |  |
Consultant Plan Expenses |  |  | $ 9,000 | 12,000 | $ 33,000 | 32,000 |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for 2017 Board Services |  | 83,334 |  |  | 83,334 |  |  |
Warrant [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Warrants,Intrinsic Value,Outstanding |  |  | $ 140,000 |  | $ 140,000 |  |  |
Warrant [Member] | Right Offering and Public Offering [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date |  |  |  |  | Jan. 25, 2019 |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Purchase Price Share Minimum |  |  |  |  | 85.00% |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 1,657,972 |  | 1,657,972 |  |  |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  |  |  |  | 10.00% |  |  |
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan |  |  | 978,310 |  | 978,310 |  |  | 882,815
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  |  | $ 499,000 |  | $ 499,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 107,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 3.80 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  |  | 10 years |  |  |
Share-Based Compensation |  |  | $ 140,000 | $ 199,000 | $ 509,000 | $ 604,000 |  |
Shares Reserved Unissued |  |  | 202,648 |  | 202,648 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years 7 months 6 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number |  |  | 720,643 |  | 720,643 |  |  | 547,532
Stock Granted During Period, Value, Share-Based Compensation, Gross |  |  |  |  | $ 224,000 |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 28,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period1 |  |  |  |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  | $ 194,000 |  | $ 194,000 |  |  |
Equity Incentive Plan [Member] | Director [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  |  | $ 75,000 |  | 75,000 |  |  |
MDB Consulting Services [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Underwriting Expense |  |  |  |  | 915,000 |  |  |
Payments for Underwriting Expense |  |  |  |  | 575,000 |  |  |
Other Underwriting Expense |  |  |  |  | $ 60,000 |  |  |

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