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Business Combinations - Summary of Aggregate Consideration Paid by Company and Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 15,031 $ 15,031 $ 14,204
Oncimmune Limited        
Business Acquisition [Line Items]        
Cash $ 1,206 $ 1,200    
Total fair value of consideration transferred 1,206      
Deposit 6      
Inventory 14      
Property and equipment 241      
Purchase option 121      
Goodwill 827      
Accrued liabilities (3)      
Total $ 1,206