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Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Components of Investments

The components of investments were as follows:


						Adjusted Cost Basis						Unrealized Gains						Unrealized Losses						Fair Value						Cash and Cash Equivalents						Marketable Securities - Current						Marketable Securities - Non-current
December 31, 2021
Changes in Fair Value Recorded in Other Comprehensive Loss
Asset backed securities						$	111,619					$	1					$	(68)					$	111,552					$	—					$	5,372					$	106,180
Certificates of deposits						6,002						—						—						6,002						—						6,002						—
Corporate notes and bonds						207,169						21						(201)						206,990						3,026						132,688						71,276
Commercial paper						109,391						—						—						109,391						24,193						85,198						—
Money market funds						51,768						—						—						51,768						51,768						—
Foreign government securities						8,186						—						(5)						8,181						—						3,008						5,173
US government securities						86,783						4						—						86,787						—						86,787						—
Total investments						$	580,918					$	26					$	(274)					$	580,671					$	78,987					$	319,055					$	182,629

Schedule of Debt Investment Maturities

Marketable Securities Maturities


						Adjusted						Estimated
						Cost Basis						Fair Value
December 31, 2021
Due in one year or less						$	319,137					$	319,053
Due after one year through five years						182,793						182,631
Due after five years through 10 years						—						—

Total						$	501,930					$	501,684