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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 10, 2020
Apr. 25, 2020
Apr. 24, 2020
Apr. 21, 2020
Oct. 04, 2018
Jul. 31, 2017
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2017
Nov. 11, 2020
Apr. 14, 2020
Class of Stock [Line Items]                                  
Common stock, par value (in dollars per share)             $ 0.001         $ 0.001   $ 0.001     $ 0.001
Proceeds from issuance of common stock, net of issuance costs                       $ 18,307,000 $ 4,049,000        
Proceeds from further issuance of share               $ 18,306,000 $ (6,000) $ (56,000) $ 4,111,000            
Common stock, shares outstanding (in shares)             4,863,984         4,863,984   859,998      
Common Stock [Member]                                  
Class of Stock [Line Items]                                  
Proceeds from further issuance of share               $ 4,000     $ 0            
Number of shares issued (in shares)               4,003,986     235,126            
April 2020 Warrants [Member]                                  
Class of Stock [Line Items]                                  
Warrants, exercise price per share             $ 5.00         $ 5.00          
Warrant to purchase each share of our common stock             1         1          
Warrants exercised                       4,000          
Number of warrants outstanding             $ 3,996,000         $ 3,996,000          
Notice period from the holder to increase the percentage of ownership of outstanding common stock after exercise of warrants                       61 days          
Outstanding common stock immediately after exercise (as a percent)                       4.99%          
Maximum percentage of outstanding common stock at election of purchaser                       9.99%          
Fractional shares issued                       0          
July 2017 Warrants [Member]                                  
Class of Stock [Line Items]                                  
Warrants, exercise price per share             $ 40.00         $ 40.00          
Warrants exercised             0         0          
Conversion percentage                       9.99%          
Number of warrants outstanding             $ 374,525         $ 374,525          
Percentage of blocker provision                       4.99%          
Common Stock Sales Agreement [Member]                                  
Class of Stock [Line Items]                                  
Common stock, par value (in dollars per share)         $ 0.001                        
Proceeds from issuance of common stock, gross                   4,300,000              
Proceeds from issuance of common stock, net of issuance costs                   $ 4,700,000              
Selling commissions, percentage         3.00%                        
Number of share sold under the sales agreement                   235,126              
Co-placement agency agreement                                  
Class of Stock [Line Items]                                  
Warrants, exercise price per share       $ 0.001                          
Share issue price per share       $ 4.999                          
Number of shares issued (in shares)       1,910,000                          
Warrant to purchase each share of our common stock       1                          
Percentage of outstanding common stock       4.99%                          
Outstanding common stock at election of purchaser       9.99%                          
Proceeds from warrants exercised     $ 18,300,000                            
Shares issued on conversion of prefunded warrants   2,090,000                              
Common stock, shares outstanding (in shares)                               4,863,984  
Co-placement agency agreement | Pre Funded Warrants [Member]                                  
Class of Stock [Line Items]                                  
Warrants, exercise price per share       $ 0.001                          
Co-placement agency agreement | Common Stock Warrants [Member]                                  
Class of Stock [Line Items]                                  
Warrants to purchase shares       4,000,000                          
Warrants, exercise price per share       $ 5.00                          
Share issue price per share       $ 5.00                          
Warrant to purchase each share of our common stock       1                          
Warrant outstanding Term       5 years                          
Maximum [Member]                                  
Class of Stock [Line Items]                                  
Warrants to purchase shares             2,090,000         2,090,000          
Maximum [Member] | Common Stock Sales Agreement [Member]                                  
Class of Stock [Line Items]                                  
Aggregate offering price         $ 5,000,000                        
Maximum [Member] | Co-placement agency agreement | Pre Funded Warrants [Member]                                  
Class of Stock [Line Items]                                  
Warrants to purchase shares       2,090,000                          
Series A Convertible Preferred Stock [Member]                                  
Class of Stock [Line Items]                                  
Preferred stock, shares issued           8,872 264         264   264      
Preferred stock, shares outstanding             264         264   264      
Number of common shares issued upon conversion           215,200                      
Number of shares converted                       6,600     8,608    
Price per share used to determine number of shares of common stock           $ 1,000                      
Conversion price of convertible preferred stock           $ 40.00                      
Conversion percentage           9.99%                      
Percentage of blocker provision           4.99%                      
Convertible preferred stock, terms of conversion                       (i) the volume weighted average price of our common stock for 30 consecutive trading days (the "Measurement Period") exceeds 300% of the initial conversion price of the Series A Preferred Stock (subject to adjustment for forward and reverse stock splits, recapitalizations, stock dividends and similar transactions), (ii) the daily trading volume on each Trading Day during such Measurement Period exceeds $500,000 per trading day and (iii) the holder is not in possession of any information that constitutes or might constitute, material non-public information which was provided by the Company.          
6% Convertible Exchangeable Preferred Stock [Member]                                  
Class of Stock [Line Items]                                  
Preferred stock, shares issued             335,273         335,273   335,273      
Preferred stock, shares outstanding             335,273         335,273   335,273      
Share issue price per share             $ 10.00         $ 10.00          
Dividend rate on convertible exchangeable preferred stock (in percent)                       6.00%   6.00%      
Share Price             $ 59,220         $ 59,220          
Percentage of closing sales price of common stock that conversion price must exceed in order for preferred stock to be convertible                       150.00%          
Number of trading days during which closing price of common stock must exceed conversion price for at least 20 days in order for the preferred stock to be convertible                       30 days          
Number of trading days prior to notice of automatic conversion                       5 days          
Accrued and unpaid dividends             $ 50,291         $ 50,291          
Redemption price per share (in dollars per share)             $ 10.00         $ 10.00          
Debt principal amount per share, basis for exchange (in dollars per share)                       $ 10.00          
Debt instrument, term                       25 years          
Preferred stock dividend declared, amount per share $ 0.15                                
6% Convertible Exchangeable Preferred Stock [Member] | Minimum [Member]                                  
Class of Stock [Line Items]                                  
Number of trading days within 30 trading days in which the closing price of common stock must exceed conversion price for preferred stock to be convertible                       20 days