Commitments and Contingencies, Finance Lease (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ft² LeaseAgreement	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 15, 2020 USD ($)
Finance Lease [Abstract]
Total lease payments	$ 55,219
Cash security deposit	455		$ 455
Finance right-of-use assets	50,311		50,521
Finance lease, liability	20,683
Finance lease, interest expense	$ 459
NJ Lease Agreement [Member]
Finance Lease [Abstract]
Area of lease | ft²	103,720
Term of finance lease agreement	15 years
Number of options to renew lease agreement | LeaseAgreement	2
Term of renewal of finance lease agreement	5 years
Estimated rent payments	$ 1,200
Percentage of annual increase in base rent	3.00%
Total lease payments	$ 29,300
Cash security deposit	300		$ 300
Finance right-of-use assets				$ 47,700
Finance lease, liability				20,200
Reclassification of construction costs in progress to right-of-use assets	300			26,500
Reclassification of prepaid rent to right-of-use assets				$ 1,100
Aggregate amount for reclassification of construction costs in progress to right-of-use assets	32,400
Finance lease, interest expense	$ 500	$ 200
AAV Current Good Manufacturing Practice (cGMP) [Member]
Finance Lease [Abstract]
Area of lease | ft²	50,000