Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Details)

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Organization and Summary of Significant Accounting Policies - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2019
USD ($)
shares
Jul. 31, 2019
USD ($)
Jan. 31, 2019
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
segment
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Schedule of Organization and Summary of Significant Accounting Policies              
Number of Operating Segments | segment         1    
Stockholders' Equity Note, Stock Split, Conversion Ratio     0.1667        
Substantial Doubt about Going Concern, Management's Evaluation           Going concern assessmentWe assess going concern uncertainty in our condensed financial statements to determine if we have sufficient cash on hand and working capital, including available borrowings on loans, to operate for a period of at least one year from the date the financial statements are issued or available to be issued, which is referred to as the "look-forward period" as defined by Accounting Standard Update ("ASU") No. 2014-15. As part of this assessment, based on conditions that are known and reasonably knowable to us, we will consider various scenarios, forecasts, projections, estimates and will make certain key assumptions, including the timing and nature of projected cash expenditures or programs, and its ability to delay or curtail expenditures or programs, if necessary, among other factors. Based on this assessment, as necessary or applicable, we make certain assumptions around implementing curtailments or delays in the nature and timing of programs and expenditures to the extent we deem probable those implementations can be achieved and we have the proper authority to execute them within the look-forward period in accordance with ASU No. 2014-15.Based upon the above assessment, we concluded that, at the date of filing the financial statements in this Quarterly Report on Form 10-Q for the six months ended June 30, 2019, we did not have sufficient cash to fund our operations for the next 12 months without additional funds and, therefore, there is substantial doubt about our ability to continue as a going concern within 12 months after the date the financial statements were issued.  
Cash and Cash Equivalents, at Carrying Value       $ 2,292,000 $ 2,292,000 $ 1,614,000 $ 9,295,000
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.001 $ 0.001 $ 0.001   $ 0.001
Proceeds from sale of common stock         $ 466,000 $ 0  
Subsequent Event              
Schedule of Organization and Summary of Significant Accounting Policies              
Proceeds from sale of common stock   $ 10,000          
Accounting Standards Update 2016-02 [Member]              
Schedule of Organization and Summary of Significant Accounting Policies              
Lessee, Operating Lease, Discount Rate     12.00%        
Fair Value, Recurring [Member] | Money Market Funds [Member]              
Schedule of Organization and Summary of Significant Accounting Policies              
Cash Equivalents, at Carrying Value       $ 1,600,000 $ 1,600,000   $ 8,900,000
Common Stock [Member]              
Schedule of Organization and Summary of Significant Accounting Policies              
Sale of common stock | shares       330,000      
Purchase Agreement [Member] | Common Stock [Member] | Subsequent Event              
Schedule of Organization and Summary of Significant Accounting Policies              
Proceeds from sale of common stock $ 1,800,000            
Stock and Warrants Issued During Period, New Issues | shares 2,852,314            
Sale of common stock | shares 1,480,000            
Purchase Agreement [Member] | Common Stock [Member] | Placement Warrants [Member] | Subsequent Event              
Schedule of Organization and Summary of Significant Accounting Policies              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 2,852,314