Alliance Revenue (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Alliance Revenue
Alliance revenue	$ 1,448
Out-license arrangement
Alliance Revenue
Alliance revenue	$ 1,400

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details