v3.19.3
Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Jan. 01, 2019
Research and Development Expense, Total   $ 5,212,000 $ 1,793,000 $ 2,137,000 $ 8,722,000    
Restricted Cash, Total   253,000 $ 55,000        
Grants Receivable       5,700,000      
Grant Reimbursements   1,900,000          
Reclassification of Warrant into Equity   $ 234,000          
Potentially dilutive shares excluded from the computation of diluted earnings per share   781,845 5,064,059        
Gain (Loss) on Extinguishment of Debt, Total   $ 11,000          
Embedded Derivative, Fair Value of Embedded Derivative Asset   0          
Embedded Derivative, Fair Value of Embedded Derivative Liability   0          
Operating Lease, Liability, Total   743,000   239,000      
Lessee, Operating Lease, Liability, Payments, Due, Total   891,000          
Operating Lease, Right-of-Use Asset   687,000          
Accounting Standards Update 2016-02 [Member]              
Operating Lease, Liability, Total             $ 227,000,000
Lessee, Operating Lease, Liability, Payments, Due, Total             $ 239,000,000
Lessee, Operating Lease, Discount Rate             9.41%
Operating Lease, Right-of-Use Asset             $ 227,000,000
Modified March 2018 and Modified September 2018 Notes [Member]              
Gain (Loss) on Extinguishment of Debt, Total $ 11,000            
Embedded Derivative, Fair Value of Embedded Derivative Liability       0   $ 0  
Research and Development Expense [Member]              
Collaboration Initiation Payment   75,000          
Money Market Funds [Member]              
Restricted Cash, Total   198,000          
Letter of Credit 1 [Member]              
Restricted Cash, Total   $ 55,000   $ 55,000 55,000    
Minimum [Member]              
Property, Plant and Equipment, Useful Life   3 years   3 years      
Maximum [Member]              
Property, Plant and Equipment, Useful Life   5 years   5 years      
Grants Receivable   $ 5,700,000          
Clinical Study, Premier Research International LLC and CRF Health, Inc. [Member]              
Research and Development Expense, Total       $ 95,000 6,200,000    
Clinical Study, PRA Health, CRF Health, Inc., Premier Research International LLC, ICON Central Laboratories, and Almac Clinical Services [Member]              
Research and Development Expense, Total       $ 185,000 $ 0    
Accounts Payable 1 [Member] | Supplier Concentration Risk [Member] | Vendor 1 [Member]              
Concentration Risk, Percentage   26.00%   52.00% 56.00%    
Accounts Payable 1 [Member] | Supplier Concentration Risk [Member] | Vendor 2 [Member]              
Concentration Risk, Percentage   26.00%   26.00% 31.00%    
Accounts Payable 1 [Member] | Supplier Concentration Risk [Member] | Vendor 3 [Member]              
Concentration Risk, Percentage   23.00%   15.00%      
Accounts Payable 1 [Member] | Supplier Concentration Risk [Member] | Two of the Three Vendors Supporting Clinical Study Activities [Member]              
Concentration Risk, Percentage   26.00%   67.00%      
Accounts Payable 1 [Member] | Supplier Concentration Risk [Member] | One of the Two Vendors Supporting Manufacturing Activities [Member]              
Concentration Risk, Percentage   26.00%     56.00%