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Revenue and Accounts Receivable Credit Concentration - Summary of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]    
Revenues $ 54,506 $ 45,557
Diagnostic Tests    
Disaggregation Of Revenue [Line Items]    
Revenues 48,937 40,919
Services    
Disaggregation Of Revenue [Line Items]    
Revenues $ 5,569 $ 4,638