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Summary of Significant Accounting Policies - Schedule of Net Revenue by Service Line (Detail) - Product Concentration Risk [Member] - Sales Revenue, Services, Net [Member] | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 100.00% | 100.00% | 100.00%
Neonatology and Other Pediatric Subspecialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 80.00% | 79.00% | 77.00%
Maternal-Fetal Medicine [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 16.00% | 16.00% | 18.00%
Pediatric Cardiology [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net revenue in percentage | 4.00% | 5.00% | 5.00%

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