Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Measurements

Schedule of assets measured at fair value on a recurring basis

	Fair Value Measurements as of March 31, 2021
	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds and bond funds	$	92,025	$	—	$	92,025	$	—
Commercial paper		513,413		—		513,413		—
	$	605,438	$	—	$	605,438	$	—
Cash and Cash Equivalents		231,005		231,005		—		—
Total Assets Measured at Fair Value	$	836,443	$	231,005	$	605,438	$	—

	Fair Value Measurements as of December 31, 2020
	Total		Level 1		Level 2		Level 3
Marketable Securities
Bonds and bond funds	$	117,928	$	—	$	117,928	$	—
Commercial paper		492,257		—		492,257		—
	$	610,185	$	—	$	610,185	$	—
Cash and Cash Equivalents		215,723		215,723		—		—
Total Assets Measured at Fair Value	$	825,908	$	215,723	$	610,185	$	—