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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Net Revenue by Service Line

The following table summarizes the Company’s net revenue from continuing operations by service line (in percentages):

		Years Ended December 31,
		2021				2020				2019
Neonatology and other pediatric subspecialties			77	%			77	%			78	%
Maternal-fetal medicine			18	%			18	%			17	%
Pediatric cardiology			5	%			5	%			5	%
			100	%			100	%			100	%

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table presents information about the Company’s financial instruments that are accounted for at fair value on a recurring basis at December 31, 2021 and 2020 (in thousands):

				Fair Value
		Fair Value Category		December 31, 2021				December 31, 2020
Assets:
Money market funds		Level 1		$	2,442			$	1,010
Short-term investments		Level 2			99,715				104,870
Mutual funds		Level 1			18,542				15,841

Financial Instruments Measured At Carrying Amount

The following table presents information about the Company’s financial instruments that are not carried at fair value at December 31, 2021 and 2020 (in thousands):

		December 31, 2021								December 31, 2020
		Carrying Amount				Fair Value				Carrying Amount				Fair Value
Liabilities:
2023 Notes			—				—				750,000				756,225
2027 Notes			1,000,000				1,047,190				1,000,000				1,070,000

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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