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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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,
		2020				2019				2018
Neonatology and other pediatric subspecialties			77	%			78	%			78	%
Maternal-fetal medicine			18	%			17	%			16	%
Pediatric cardiology			5	%			5	%			6	%
			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, 2020 and 2019 (in thousands):

						Fair Value
		Fair Value Category				December 31, 2020				December 31, 2019
Assets:
Money market funds			Level 1			$	1,010			$	16,775
Short-term investments			Level 2				104,870				74,510
Mutual funds			Level 1				15,841				14,264

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, 2020 and 2019 (in thousands):

		December 31, 2020								December 31, 2019
		Carrying Amount				Fair Value				Carrying Amount				Fair Value
Liabilities:
2023 Notes			750,000				756,225				750,000				766,875
2027 Notes			1,000,000				1,070,000				500,000				1,025,600

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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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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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