Quarterly report pursuant to Section 13 or 15(d)

Xoma License Agreement (Details Textual)

v3.19.1
Xoma License Agreement (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 07, 2019
Mar. 31, 2019
Mar. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Payment of license $ 8,500,000                    
Liabilities   $ 10,814,755 $ 10,814,755           $ 6,463,637    
Liabilities, Current   6,623,756 6,623,756           6,248,014    
Cash   15,344,013 15,344,013           1,645,872 $ 78,119 $ 4,486,538
Delay fee   50,000 50,000                
Payment for Accrued Liabilities   399,000                  
License Fees   5,476,000 5,476,000                
Contractual Obligation   4,500,000 4,500,000                
License Fees Payable Noncurrent   $ 4,000,000 $ 4,000,000           $ 0    
Common Stock, Shares, Outstanding   61,866,319 61,866,319           62,166,309    
Xoma [Member]                      
Common Stock, Shares, Outstanding   8,100,000 8,100,000                
Xoma [Member] | Put Option [Member]                      
Description Of Option Indexed To Issuers Equity Shares     Xoma may exercise the Put option for up to a total of 2.5 million shares of Common Stock for the year ending December 31, 2020, and up to an additional 2.5 million shares thereafter.                
License Agreement Terms [Member]                      
Qualified Financing Future Cash Payments   $ 8,500,000 $ 8,500,000                
License Agreement Terms [Member] | Subsequent Event [Member]                      
Qualified Financing Future Cash Payments Due       $ 2,000,000 $ 2,000,000 $ 2,000,000 $ 1,000,000 $ 1,500,000      
License [Member]                      
Proceeds from License Fees Received   $ 5,476,000