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Discontinued Operations - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 26, 2020
Feb. 28, 2020
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Gain in discontinued operations, net of tax     $ 4,250 $ (1,582) $ (1,634)
Net gain on sale of business   $ 14,338   14,338  
Amortization       100 800
Depreciation or capital expenditure       0 0
Investing non-cash items       0 0
Estimated Deferred Payment From Medexus $ 400     $ 200  
Hyperimmune [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Amount received in exchange of outstanding milestone payment     $ 4,250    
gain on milestone payment related to the sale         $ 4,300