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Subsequent Events (Details) - Subsequent Event [Member] - Exclusive License Agreement [Member]
$ / shares in Units, $ in Thousands
Oct. 15, 2020
USD ($)
$ / shares
shares
Subsequent Event [Line Items]  
Profit sharing percentage 60.00%
Vifor International Ltd. [Member]  
Subsequent Event [Line Items]  
Non-refundable, non-creditable upfront payment $ 100,000
Purchase of common stock value $ 50,000
Common stock, shares issued | shares 2,939,552
Purchase common stock per share amount | $ / shares $ 17.0094
Additional stock investment eligible upon U.S. regulatory approval $ 50,000
Stock issuance premium percent 20.00%
Stock issuance price measurement period 30 days
Potential milestone payments receivable $ 240,000
Vifor International Ltd. [Member]  
Subsequent Event [Line Items]  
Profit sharing percentage 40.00%