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Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Feb. 28, 2018
Feb. 27, 2018
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
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         $ 377,000  
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.  
Stock Granted, Value, Share-based Compensation, Gross $ 11,700,000          
General And Administrative Expense Related To Stock Grant         $ 212,000  
Proceeds from Issuance or Sale of Equity         23,511,000 $ 8,667,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value         $ 0  
Other Underwriting Expense       $ 60,000    
Share Price       $ 3.03    
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 0.97    
Stock Issued During Period In Payment Of Accrued Compensation Per Share     $ 3.60     $ 3.60
Stock Issued During Period Value In Payment Of Accrued Compensation   $ 490,000       $ 490,000
Common Stock, Par or Stated Value Per Share         $ 0.0001 $ 0.0001
General and Administrative Expense         $ 5,622,000 $ 5,160,000
Warrants Intrinsic Value Outstanding         $ 0  
Stock Issued During Period, Shares, New Issues 5,213,543          
Proceeds from Issuance of Private Placement $ 11,600,000          
Sale of Stock, Price Per Share $ 4          
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 478,854          
Equity Method Investment Ownership Percentage Description In no event may the Participation Right be exercised to the extent it would cause the Investor or any of its affiliates to beneficially own 20% or more of the Company's then outstanding common stock or hold shares with 20% or more of the voting power.          
Underwritten Public Offering [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Value, New Issues       $ 9.6    
Proceeds from Issuance or Sale of Equity       $ 8.7    
Offering [Member]            
Class of Stock [Line Items]            
Proceeds from Issuance or Sale of Equity   $ 11,900,000        
Stock Issued During Period, Shares, Other       2,395,471    
Shares Issued, Price Per Share $ 2.25 $ 2.25   $ 4.00    
Warrants Authorized For Issuance To Acquire Common Stock Shares Number   5,750,000   2,395,471    
Employee Stock Option [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         224,000  
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         $ 1.94  
Allocated Share-based Compensation Expense         $ 43,000  
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         $ 1.85  
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         $ 2.10  
General and Administrative Expense [Member]            
Class of Stock [Line Items]            
General and Administrative Expense           $ 300,000
Stock Issued During Period, Shares, New Issues         114,865  
Consultant Plan [Member]            
Class of Stock [Line Items]            
Common Stock, Capital Shares Reserved for Future Issuance         199,705  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         7,500 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 3.50  
General And Administrative Expense Related To Stock Grant         $ 26,000 $ 35,000
Consultant Plan Expenses         $ 30,000 42,000
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         236,000  
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  
General And Administrative Expense Related To Stock Grant         $ 4,000  
Share Based Compensation Arrangement By Share Based Payment Award Options Value Grants In Period Weighted Average Grant Date Fair Value         $ 14,000  
General And Administrative Expense Related To Stock Grant In Shares         2,500  
Common Stock [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Value, New Issues           $ 1,000
Stock Issued During Period, Shares, Other         10,963,543  
Stock issued During Period Shares In Payment Of Accrued Compensation   136,110       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
Stock Issued During Period, Shares, New Issues           2,395,471
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 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         2,768,618  
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         224,000 127,000
Mdb Consulting Services [Member]            
Class of Stock [Line Items]            
Underwriting Expense       $ 915,000    
Payments for Underwriting Expense       575,000    
Other Underwriting Expense       $ 60,000    
Mr Pirnat [Member]            
Class of Stock [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2         2 years