Alliance Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Alliance Revenue
Alliance revenue	$ 1,448	$ 662
Deferred revenue recognized during the period		$ 600
Out-license arrangement
Alliance Revenue
Alliance revenue	1,400
Gsk Collaboration
Alliance Revenue
Alliance revenue	500
Other
Alliance Revenue
Alliance revenue	$ 200

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
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details