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Segment Reporting - Summary of Reportable Revenues by Geographic Regions (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Total revenue $ 77,262 $ 79,416
United States    
Segment Reporting Information [Line Items]    
Total revenue 73,880 75,989
Europe    
Segment Reporting Information [Line Items]    
Total revenue 2,545 2,252
Rest of World    
Segment Reporting Information [Line Items]    
Total revenue 837 1,175
Testing services revenue    
Segment Reporting Information [Line Items]    
Total revenue 61,784 66,444
Testing services revenue | United States    
Segment Reporting Information [Line Items]    
Total revenue 61,647 66,223
Testing services revenue | Rest of World    
Segment Reporting Information [Line Items]    
Total revenue 137 221
Product revenue    
Segment Reporting Information [Line Items]    
Total revenue 6,861 6,788
Product revenue | United States    
Segment Reporting Information [Line Items]    
Total revenue 3,727 3,613
Product revenue | Europe    
Segment Reporting Information [Line Items]    
Total revenue 2,461 2,242
Product revenue | Rest of World    
Segment Reporting Information [Line Items]    
Total revenue 673 933
Patient and digital solutions revenue    
Segment Reporting Information [Line Items]    
Total revenue 8,617 6,184
Patient and digital solutions revenue | United States    
Segment Reporting Information [Line Items]    
Total revenue 8,506 6,153
Patient and digital solutions revenue | Europe    
Segment Reporting Information [Line Items]    
Total revenue 84 10
Patient and digital solutions revenue | Rest of World    
Segment Reporting Information [Line Items]    
Total revenue $ 27 $ 21