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Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Jan. 25, 2017 | Feb. 28, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2011 | Jan. 02, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  | $ 17,491,000 |  |
Stock Issued During Period, Value, Issued for Noncash Considerations |  |  |  |  |  | $ 125,000 |
Common Stock, Shares Authorized |  |  |  | 62,500,000 |  |  |
Preferred Stock, Shares Authorized |  |  |  | 2,000,000 |  |  |
Declining Repurchase Rights Per Share |  |  |  |  |  |  | $ 0.0001
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized |  |  |  | $ 675,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 20,000 | 26,000 |  |
Proceeds From Issuance Or Sale Of Equity |  |  |  | $ 0 | $ 16,279,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  | $ 173,000 |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 17,500,000 |  |  |  |
Other Cost and Expense, Operating |  |  | 108,000 |  |  |  |
Proceeds From Issuance Or Sale Of Equity |  |  | 16,300,000 |  |  |  |
Payment of Financing and Stock Issuance Costs |  |  | $ 1,200,000 |  |  |  |
Stock Issued During Period Shares Underwritten Public Offering |  |  | 2,990,000 |  |  |  |
Stock Issued in Underwritten Public Offering Price Per Share |  |  | $ 5.85 |  |  |  |
Underwriter Agent fees |  |  | $ 1,049,000 |  |  |  |
Payments for Underwriter Agent Legal Fees |  |  | $ 55,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 219,444 |  |  |  |  |  |
Subsequent Event [Member] | Right Offering [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number |  | 2,395,471 |  |  |  |  |
Proceeds From Issuance Or Sale Of Equity |  | $ 8,700,000 |  |  |  |  |
Stock Issued During Period, Shares, Other |  | 2,395,471 |  |  |  |  |
Shares Issued, Price Per Share |  | $ 4.00 |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 171,900 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  | 10 years |  |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  |  |  | $ 419,000 |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 397,000 | $ 579,000 |  |
Stock Issued During Period, Shares, Other |  |  |  | 60,883 | 40,371 |  |
Shares Issued, Price Per Share |  |  |  | $ 2.20 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  | 4.22 |  |  |
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 |  |  |  | 4.21 |  |  |
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 |  |  |  | $ 4.85 |  |  |
Shares Issued, Price Per Share |  |  |  |  | $ 5.21 |  |
Consultant Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 116,883 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 10,000 | 5,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 3.96 |  |  |
Consultant Plan Expenses |  |  |  | $ 44,000 | $ 20,000 |  |
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 |  |  |  | 1,242,000 |  |  |
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 |  |  |  | 923,000 |  |  |
Warrant [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Warrants Authorized For Issuance To Acquire Common Stock Shares Number |  |  |  | 2,395,471 |  |  |
Exercise Price Of Warrants |  |  |  | $ 4.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 0 | $ 0 |  |
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 |  |  |  | 1,407,269 |  |  |
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 |  |  |  | 171,900 | 409,200 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  | $ 3.40 | $ 5.97 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2 |  |  |  |  | 10 years |  |
Stock Granted During Period, Value, Share-Based Compensation, Gross |  |  |  | $ 150,000 | $ 137,000 |  |
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period |  |  |  | 44,112 | 23,034 |  |
Equity Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  | $ 78,000 |  |  |
Equity Incentive Plan [Member] | Employee Stock Option One [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 |  |  |  |  | $ 3.96 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | 5.39 |  |
Equity Incentive Plan [Member] | Employee Stock Option Two [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 |  |  |  |  | $ 5.97 |  |
Equity Incentive Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Stock Grants In Period |  |  |  |  | 300,000 |  |

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