Quarterly report pursuant to Section 13 or 15(d)

Business and Viability of Operations (Details)

v3.19.2
Business and Viability of Operations (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 24, 2019
USD ($)
$ / shares
shares
Apr. 18, 2019
USD ($)
$ / shares
shares
Jul. 26, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Jun. 15, 2018
shares
Jul. 23, 2010
shares
Stockholders' Equity, Reverse Stock Split               15-for-1    
Preferred Stock, Shares Authorized | shares               20,000,000    
Common Stock, Shares Authorized | shares       200,000,000 200,000,000   200,000,000 200,000,000    
Common Stock, Shares, Issued | shares       19,727,431 19,727,431   15,366,327 324,821   4,872,221
Preferred Stock, Shares Issued | shares     2,762,594         2,762,594   41,438,818
Retained Earnings (Accumulated Deficit)       $ (181,029,000) $ (181,029,000)   $ (175,640,000) [1]      
Cash and Cash Equivalents, at Carrying Value       3,322,000 3,322,000   $ 3,218,000 [1]      
Proceeds from Issuance of Common Stock         $ 4,664,000 $ 0        
Stock Issued During Period, Value, New Issues       $ 4,664,000            
Convertible Preferred Stock, Shares Issued upon Conversion | shares     2,762,594              
Debt Instrument, Convertible, Number of Equity Instruments     9,527,144              
Repayments of Notes Payable     $ 200,000              
Temporary Equity, Par or Stated Value Per Share | $ / shares       $ 0.0001 $ 0.0001   $ 0.0001      
Temporary Equity, Dividend Rate, Percentage         8.00%   8.00%      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   255,102             208,350  
Series A Preferred Stock [Member]                    
Shares, Issued | shares   250,000                
Temporary Equity, Par Value Per Share | $ / shares   $ 0.0001                
Temporary Equity, Stated Value Per Share | $ / shares   $ 4.00                
Temporary Equity, Dividend Rate, Percentage   8.00%                
Convertible Preferred Stock Conversion Price | $ / shares   $ 4.00   $ 4.00 $ 4.00          
Convertible Preferred Stock Floor Price Per Share | $ / shares   $ 1.50                
Proceeds from Issuance of Convertible Preferred Stock   $ 1,000,000   $ 920,000            
Series A Preferred Stock [Member] | Minimum [Member]                    
Convertible Preferred Stock Conversion Price | $ / shares   $ 1.50                
Proceeds from Issuance of Convertible Preferred Stock   $ 500,000                
Series A Preferred Stock [Member] | Maximum [Member]                    
Proceeds from Issuance of Convertible Preferred Stock   $ 5,000,000                
IPO [Member]                    
Shares Issued, Price Per Share | $ / shares $ 1.33   $ 5.00              
Proceeds from Issuance of Common Stock $ 4,664,000   $ 10,273,000              
Stock Issued During Period, Value, New Issues $ 5,420,000   $ 12,000,000              
Stock Issued During Period, Shares, New Issues | shares 4,075,726   2,400,000              
Payments for Underwriters Discounts and Commissions     $ 900,000              
Payments for Underwriters Accountable and Nonaccountable Expenses     220,000              
Payments of Stock Issuance Costs     $ 607,000              
[1] The condensed consolidated balance sheet as of December 31, 2018 was derived from the audited consolidated balance sheet as of that date.