Revenue Arrangements - Schedule of Changes in Contract Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Contract liabilities:
Deferred revenue, beginning of period	$ 16,354
Contract liabilities, beginning of period	16,354
Deferred revenue, additions	104,158
Contract liabilities, additions	104,158
Deferred revenue, deductions	(4,673)
Contract liabilities, deductions	(4,673)
Deferred revenue, end of period	115,839
Contract liabilities, end of period	$ 115,839