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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