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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)	1 Months Ended		12 Months Ended
	Sep. 30, 2019	Jul. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies
Deferred revenue, current			$ 14,602,000	$ 22,000
Amortization of contract assets			0
Impairments of contract assets			0
Upfront payment
Summary of Significant Accounting Policies
Deferred revenue, current			200,000
License Agreement with SIBV
Summary of Significant Accounting Policies
Upfront payment received		$ 5,000,000
License Agreement with SAMR
Summary of Significant Accounting Policies
Upfront payment received	$ 15,000,000	$ 5,000,000	42,500,000
License Agreement
Summary of Significant Accounting Policies
Deferred revenue, current			$ 14,600,000