Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

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

The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying consolidated balance sheets:

	As of December 31, 2020						As of December 31, 2019
Fair Value Measurements:	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Marketable securities (see Note 7)
Equity securities	$	—	$	—	$	—	$	4,404	$	—	$	—
Money market and mutual funds	104,672		—		—		38,799		—		—
Corporate bonds	—		22,155		—		—		4,098		—
Government securities - U.S.	—		18,999		—		—		5,446		—
Other fixed-income securities	—		3,854		—		—		1,637		—
Total assets	$	104,672	$	45,008	$	—	$	43,203	$	11,181	$	—
Contingent consideration payable (see Note 13)	—		—		—		—		—		17,327
Total liabilities	$	—	$	—	$	—	$	—	$	—	$	17,327