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Revenue Arrangements - Schedule of Changes in Contract Liabilities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Contract liabilities:  
Deferred revenue, beginning of period $ 110,796
Contract liabilities, beginning of period 110,796
Deferred revenue, additions 0
Contract liabilities, additions 0
Deferred revenue, deductions (2,730)
Contract liabilities, deductions (2,730)
Deferred revenue, end of period 108,066
Contract liabilities, end of period $ 108,066