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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