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Investments (Tables) | 12 Months Ended
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Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |
Components of Investments | The components of investments were as follows:
| As of December 31, 2022
| Adjusted Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Marketable Securities - Current |  | Marketable Securities - Non-current
Asset-backed securities | $ | 58,455 |  |  | $ | 1 |  |  | $ | (264) |  |  | $ | 58,192 |  |  | $ | — |  |  | $ | 1,464 |  |  | $ | 56,728 |
Corporate notes and bonds | 111,592 |  |  | — |  |  | (1,294) |  |  | 110,298 |  |  | — |  |  | 110,298 |  |  | — |
Commercial paper | 10,477 |  |  | 2 |  |  | — |  |  | 10,479 |  |  | — |  |  | 10,479 |  |  | — |
Money market funds | 232,448 |  |  | — |  |  | — |  |  | 232,448 |  |  | 232,448 |  |  | — |  |  | — |
Foreign government securities | 5,064 |  |  | — |  |  | (37) |  |  | 5,027 |  |  | — |  |  | 5,027 |  |  | — |
US government and agency securities | 86,869 |  |  | 29 |  |  | — |  |  | 86,898 |  |  | 86,898 |  |  | — |  |  | — |
Total investments | $ | 504,905 |  |  | $ | 32 |  |  | $ | (1,595) |  |  | $ | 503,342 |  |  | $ | 319,346 |  |  | $ | 127,268 |  |  | $ | 56,728 |
| As of December 31, 2021
| Adjusted Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Marketable Securities - Current |  | Marketable Securities - Non-current
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 | 207,170 |  |  | 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 and agency securities | 86,783 |  |  | 4 |  |  | — |  |  | 86,787 |  |  | — |  |  | 86,787 |  |  | — |
Total investments | $ | 580,919 |  |  | $ | 26 |  |  | $ | (274) |  |  | $ | 580,671 |  |  | $ | 78,987 |  |  | $ | 319,055 |  |  | $ | 182,629 |
Schedule of Unrealized Losses on Debt Investments | Marketable securities with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:
| As of December 31, 2022
| Less than 12 Months |  | 12 Months or more |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Asset-backed securities | $ | 52,412 |  |  | $ | (229) |  |  | $ | 4,656 |  |  | $ | (35) |  |  | $ | 57,068 |  |  | $ | (264) |
Corporate notes and bonds | 55,864 |  |  | (571) |  |  | 54,434 |  |  | (723) |  |  | 110,298 |  |  | (1,294) |
Foreign government securities | — |  |  | — |  |  | 5,027 |  |  | (37) |  |  | 5,027 |  |  | (37) |
Total investments | $ | 108,276 |  |  | $ | (800) |  |  | $ | 64,117 |  |  | $ | (795) |  |  | $ | 172,393 |  |  | $ | (1,595) |
Schedule of Debt Investment Maturities | Marketable Securities Maturities
|  | Adjusted |  | Estimated |
|  | Cost Basis |  | Fair Value |
December 31, 2022 |  |  |  |  |
Due in one year or less |  | $ | 128,597 |  |  | $ | 127,268 |  |
Due after one year through five years |  | 56,990 |  |  | 56,728 |  |
Total |  | $ | 185,587 |  |  | $ | 183,996 |  |

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