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Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Feb. 27, 2018 | Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 7,258,000 |
Common Stock, Shares Authorized |  |  |  | 62,500,000 |
Preferred Stock, Shares Authorized |  |  |  | 2,000,000 |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  |  |  | $ 436,000 |
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. |
General And Administrative Expense Related To Stock Grant |  |  |  | $ 35,000 | $ 49,000
Proceeds From Issuance Or Sale Of Equity |  |  |  | 8,667,000 | $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  | $ 207,000 |
Other Underwriting Expense |  |  | $ 60,000 |  |
Share Price |  |  | $ 3.03 |  |
Fair Value Assumptions, Exercise Price |  |  | $ 0.97 |  |
Stock Issued During Period In Payment Of Accrued Compensation Per Share |  |  |  | $ 3.60 |
Stock Issued During Period Value In Payment Of Accrued Compensation |  |  |  | $ 490,000 |
Common Stock, Par Or Stated Value Per Share |  |  |  | $ 0.0001 | $ 0.0001
General and Administrative Expense |  |  |  | $ 5,160,000 | $ 6,510,000
Warrants Intrinsic Value Outstanding |  |  |  | $ 144,000 |
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 |  |
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 |  |
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 12,900,000 |  |  |
Shares Issued, Price Per Share |  | $ 2.25 |  |  |
Subsequent Event [Member] | Offering [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number | 5,750,000 |  |  |  |
Proceeds From Issuance Or Sale Of Equity | $ 11,900,000 |  |  |  |
Shares Issued, Price Per Share | $ 2.25 |  |  |  |
Employee Stock Option [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 127,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  | 10 years |
Stock Issued During Period, Shares, Other |  |  |  |  | 60,883
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | $ 3.69 |
Employee Stock Option [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 |  |  |  | 3.10 |
Shares Issued, Price Per Share |  |  |  |  | $ 2.20
Employee Stock Option [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 |  |  |  | $ 3.80 |
Shares Issued, Price Per Share |  |  |  |  | $ 4.51
General and Administrative Expense [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
General and Administrative Expense |  |  |  | $ 300,000 |
Consultant Plan [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 99,159 |
Consultant Plan [Member] | Employee Stock Option [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 233,000 |
Consultant Plan One [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Consultant Plan Expenses |  |  |  | $ 42,000 | $ 44,000
Consultant Plan One [Member] | Employee Stock Option [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 59,000 |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 1,000 |
Stock issued During Period Shares In Payment Of Accrued Compensation |  |  |  | 136,110 |
Stock Issued During Period Value In Payment Of Accrued Compensation |  |  |  | $ 0 |
Stock Issued During Period Shares Issued For 2017 Board Services |  |  |  | 83,334 |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period |  |  |  | 3.60 |
Warrant [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Exercise Price Of Warrants |  |  |  | $ 4.00 |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercised In Period |  |  |  | 0 | 118,959
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 |  |  |  | 1,662,530 |
Increase Decrease Of Share Based Compensation Arrangement By Share Based Payment Award Percentage |  |  |  | 10.00% |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 127,000 | 171,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 3.40
Stock Granted During Period, Value, Share-Based Compensation, Gross |  |  |  |  | $ 150,000
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period |  |  |  | 219,444 | 44,112
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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