Business Acquisition - Allocation of the purchase price to the assets acquired and liabilities assumed (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Assets acquired:
Goodwill	$ 11,100
Aceragen
Assets acquired:
Cash, cash equivalents and restricted cash	5,482
Receivables	1,914
Prepaid expenses and other assets	575
In-process research and development assets	71,600
Goodwill	11,100
Total assets acquired	90,671
Liabilities assumed:
Accounts Payable and accrued expenses	7,886
Acquisition Obligation (Note 7)	7,546
Operating lease liabilities	22
Deferred tax liabilities	9,601
Total liabilities assumed	25,055
Net assets acquired	$ 65,616