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Investments
12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Investment Components
The components of investments were as follows:

 Adjusted Cost BasisUnrealized GainsUnrealized LossesFair ValueCash and Cash EquivalentsMarketable Securities -
Current
Marketable Securities -
Non-current
December 31, 2021
Changes in Fair Value Recorded in Other Comprehensive Loss
Asset backed securities$111,619 $$(68)$111,552 $— $5,372 $106,180 
Certificates of deposits6,002 — — 6,002 — 6,002 — 
Corporate notes and bonds207,169 21 (201)206,990 3,026 132,688 71,276 
Commercial paper109,391 — — 109,391 24,193 85,198 — 
Money market funds51,768 — — 51,768 51,768 — 
Foreign government securities8,186 — (5)8,181 — 3,008 5,173 
US government securities86,783 — 86,787 — 86,787 — 
Total investments$580,918 $26 $(274)$580,671 $78,987 $319,055 $182,629 

The Company did not have marketable securities during the year ended December 31, 2020.
Non-marketable equity securities are investments in privately held companies without readily determinable fair values. The carrying value of the Company’s investments without readily determinable fair values was $55.6 million as of December 31, 2021 and is classified within “Investments in non-marketable equity securities” in our consolidated balance sheets. The Company did not have any investments without readily determinable fair values as of December 31, 2020. The Company did not record any adjustments to the carrying value of its non-marketable equity securities accounted for under the measurement alternative, and did not recognize any gains or losses related to the sale of non-marketable equity securities in the year ended December 31, 2021.
Unrealized Losses on Marketable Securities
The Company did not have any marketable securities with unrealized losses for more than 12 months. Unrealized losses from fixed-income securities are primarily attributable to changes in interest rates.
Marketable Securities Maturities
AdjustedEstimated
Cost BasisFair Value
December 31, 2021
Due in one year or less$319,137 $319,053 
Due after one year through five years182,793 182,631 
Due after five years through 10 years— — 
Total$501,930 $501,684