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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 |  |  |  |  |  |  |  |  |

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