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Stockholders' Equity (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 04, 2018
Jul. 31, 2017
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Stockholders Equity [Line Items]          
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001
Proceeds from issuance of common stock       $ 4,049,000  
Preferred stock, par value (in dollars per share)       $ 0.001 $ 0.001
Number of warrant outstanding       $ 7,490,500  
Warrant exercise price       $ 2.00  
Condition related to exercising warrants       The warrants expire in 2024. Subject to limited exceptions, a holder of warrants will not have the right to exercise any portion of its warrants if the holder (together with such holder's affiliates, and any persons acting as a group together with such holder or any of such holder's affiliates) would beneficially own a number of shares of common stock in excess of 4.99% (or, at the election of the purchaser, 9.99%) of the shares of our Common Stock then outstanding after giving effect to such exercise  
Warrant [Member]          
Stockholders Equity [Line Items]          
Conversion percentage   9.99%      
Percentage of blocker provision   4.99%      
Sales Agreement [Member] | H.C. Wainwright & Co., LLC [Member]          
Stockholders Equity [Line Items]          
Common stock, par value (in dollars per share) $ 0.001        
Aggregate offering price $ 5,000,000        
Selling commissions, percentage 3.00%        
Number of share sold under the sales agreement     4,702,527    
Proceeds from issuance of common stock     $ 4,300,000    
Net proceeds from issuance of common stock     $ 4,700,000