Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Textual)

v3.19.1
Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2019
Jan. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]        
Less change in fair value of warrant liability $ 0      
Cash and Cash Equivalents, at Carrying Value $ 5,909,000   $ 9,295,000 $ 3,465,000
Common Stock, Par or Stated Value Per Share   $ 0.001    
Lease Expiration Date Jun. 30, 2021      
Accounting Standards Update 2016-02 [Member]        
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]        
Lessee, Operating Lease, Discount Rate   12.00%    
Fair Value, Recurring [Member] | Money Market Funds [Member]        
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure $ 5,000,000   $ 8,900,000