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Summary of Significant Accounting Policies - Schedule of Net Revenue by Service Line (Detail) - Product Concentration Risk - Sales Revenue, Services, Net	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net revenue in percentage	100.00%	100.00%	100.00%
Neonatology and Other Pediatric Subspecialties
Segment Reporting Information [Line Items]
Net revenue in percentage	83.00%	84.00%	84.00%
Maternal-Fetal Medicine
Segment Reporting Information [Line Items]
Net revenue in percentage	17.00%	16.00%	16.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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