License Agreement - Beijing (Details) - License Agreement with Beijing SL - USD ($) $ in Thousands		12 Months Ended
	Jul. 23, 2019	Dec. 31, 2019
License Agreements
Revenue recognized from the agreement		$ 0
Upfront payment to be received	$ 2,500	$ 2,500
Period from effective date within which upfront gross payment to be paid	45 days
Developmental and regulatory milestone payment eligible to be received	$ 6,000
Global net sales milestone payment to be received	$ 20,000
Maximum
License Agreements
Percentage of royalty on net sales		20.00%