Investments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Company's Recurring Financial Assets and Liabilities Subject to Fair Value Measurements

The Company’s financial assets and liabilities subject to fair value measurements were as follows:

	Fair Value Measurements as of March 31, 2022
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds (1)	$	153,948	$	153,948	$	—	$	—
Commercial paper (1)	43,002		—		43,002		—
Certificates of deposit (2)	110		—		110		—
Investment securities at fair value
Equity securities at fair value
Marketable equity securities	18,962		18,962		—		—
Mutual funds invested in debt securities	22,538		22,538		—		—
Total equity securities at fair value	41,500		41,500		—		—
Debt securities available for sale
U.S. government securities	5,585		—		5,585		—
Corporate securities	55,324		—		55,324		—
U.S. government and federal agency	19,173		—		19,173		—
Commercial paper	10,540		—		10,540		—
Foreign fixed-income securities	1,216		—		1,216		—
Total debt securities available for sale	91,838		—		91,838		—
Total investment securities at fair value	133,338		41,500		91,838		—
Long-term investments
Long-term investment securities at fair value (3)	31,057		—		—		—
Total	$	361,455	$	195,448	$	134,950	$	—
Liabilities:
Fair value of contingent liability	$	965	$	—	$	—	$	965
Total	$	965	$	—	$	—	$	965

(1)     Amounts included in Cash and cash equivalents on the condensed consolidated balance sheets.

(2)    Amounts included in current restricted assets and non-current restricted assets on the condensed consolidated balance sheets.

(3)    In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.

	Fair Value Measurements as of December 31, 2021
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds (1)	$	130,583	$	130,583	$	—	$	—
Commercial paper (1)	24,426				24,426		—
Certificates of deposit (2)	110				110		—
Investment securities at fair value
Equity securities at fair value
Marketable equity securities	19,560		19,560		—		—
Mutual funds invested in debt securities	23,221		23,221		—		—
Total equity securities at fair value	42,781		42,781		—		—
Debt securities available for sale
U.S. government securities	6,481		—		6,481		—
Corporate securities	47,531		—		47,531		—
U.S. government and federal agency	19,572		—		19,572		—
Commercial paper	29,103		—		29,103		—
Foreign fixed-income securities	1,219		—		1,219		—
Total debt securities available for sale	103,906		—		103,906		—
Total investment securities at fair value	146,687		42,781		103,906		—
Long-term investments
Long-term investment securities at fair value (3)	32,089		—		—		—
Total	$	333,895	$	173,364	$	128,442	$	—
Liabilities:
Fair value of contingent liability	$	2,646	$	—	$	—	$	2,646
Total	$	2,646	$	—	$	—	$	2,646

(1)     Amounts included in Cash and cash equivalents on the condensed consolidated balance sheets.

(2)    Amounts included in current restricted assets and non-current restricted assets on the condensed consolidated balance sheets.

(3)    In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.

Nonrecurring Fair Value Measurements

The Company’s investments in real estate ventures subject to nonrecurring fair value measurements are as follows:

			Fair Value Measurement Using:
	Year Ended December 31, 2021				Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	Impairment Charge		Total
Assets:
Investments in real estate ventures	$	2,713	$	—	$	—	$	—	$	—