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License and Collaboration Agreements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 18 Months Ended
Apr. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
License and Collaboration Agreement with Zai Lab          
Accounts receivable   $ 7,000 $ 7,000   $ 7,000
Revenue   7,000 7,000 $ 5,000  
License and collaboration agreement with Zai Lab          
License and Collaboration Agreement with Zai Lab          
Upfront, non-refundable payment received $ 5,000       5,000
Research support funding         600
Certain other reimbursable clinical trial costs         300
Payment received, tax expense         800
Eligible amount receivable in research and development support payments and development, regulatory and sales milestone payments   98,000 98,000   98,000
Accounts receivable   7,000 7,000   $ 7,000
Revenue   $ 7,000 $ 7,000 $ 5,000