Collaboration and Profit-Sharing Agreements - Revenue Recognition (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Accounts receivable
Accounts receivable, Balance at Beginning of Period	$ 418
Accounts Receivable, Additions	1,447
Accounts receivable, Balance at End of Period	1,865
Contract liabilities:
Deferred Revenue, Balance at Beginning of Period	186,721
Deferred revenue, Additions	508
Deferred revenue, Deductions	(7,883)
Deferred Revenue, Balance at End of Period	$ 179,346