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Investments | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments Investment Components 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 |  |
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
|  | 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 |  |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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