Related Party Transactions - Advent BioServices Sublease Agreement (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($) ft² item	Jun. 30, 2023 GBP (£) ft² item	Jun. 30, 2023 USD ($) ft² item	Jun. 30, 2022 USD ($)
Related Party Transactions
Total area of lease (in sqft) | ft²	88,000	88,000	88,000
Lease payments			$ 457,000	$ 469,000
Sub-lease income	$ 36,000		$ 72,000	$ 73,000
Advent BioServices
Related Party Transactions
Area of sublease (in sqft) | item	14,459	14,459	14,459
Total area of lease (in sqft) | ft²	88,000	88,000	88,000
Number of times calculated for lease payment under sub-lease | item		2	2
Rate per square foot under sub-lease		£ 5.75	$ 7.28
Cap rate per square foot under sub-lease			10
Sub-lease payments receivable			145,000
Lease payments | £		£ 500,000
Approximate lease payments			$ 633,000