Commitments and Contingencies, Finance Lease (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) ft² LeaseAgreement	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Mar. 15, 2020 USD ($)
Finance Lease [Abstract]
Total lease payments	$ 54,812		$ 54,812
Cash security deposit	455		455		$ 455
Finance right-of-use assets	49,507		49,507		50,521
Finance lease, liability	$ 20,736		20,736
Finance lease, interest expense			$ 920
NJ Lease Agreement [Member]
Finance Lease [Abstract]
Area of lease | ft²			103,720
Term of finance lease agreement	15 years		15 years
Number of options to renew lease agreement | LeaseAgreement			2
Term of renewal of finance lease agreement	5 years		5 years
Estimated rent payments			$ 1,200
Percentage of annual increase in base rent			3.00%
Total lease payments	$ 29,300		$ 29,300
Cash security deposit	300		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	100		100			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	32,200		32,200
Finance lease, interest expense	$ 500	$ 500	$ 900	$ 600
AAV Current Good Manufacturing Practice (cGMP) [Member]
Finance Lease [Abstract]
Area of lease | ft²			50,000