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Segment Reporting - Reportable Revenues by Geographic Regions (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Total revenue | $ 67,400 | $ 38,380
United States |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 63,804 | 35,573
Rest of World |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 1,313 | 775
Europe |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 2,283 | 2,032
Testing services |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 59,281 | 31,442
Testing services | United States |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 59,021 | 31,329
Testing services | Rest of World |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 260 | 113
Product |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 5,778 | 4,695
Product | United States |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 2,495 | 2,061
Product | Rest of World |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 1,031 | 632
Product | Europe |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 2,252 | 2,002
Digital And Other |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 2,341 | 2,243
Digital And Other | United States |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 2,288 | 2,183
Digital And Other | Rest of World |  |
Segment Reporting Information [Line Items] |  |
Total revenue | 22 | 30
Digital And Other | Europe |  |
Segment Reporting Information [Line Items] |  |
Total revenue | $ 31 | $ 30

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