| Assets Measured at Fair Value on Recurring Basis |
The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of June 30, 2020 (in thousands): | | | | | | | | | | | | | | | | | | | | | Level 1 | | Level 2 | | | | Total | | Cash equivalents: | | | | | | | | | Money market funds | $ | 489,607 | | | $ | — | | | | | $ | 489,607 | | | Commercial paper | — | | | 47,691 | | | | | 47,691 | | | Corporate notes and bonds | — | | | 20,944 | | | | | 20,944 | | | Certificates of deposit | — | | | 5,002 | | | | | 5,002 | | | U.S. government and agency securities | — | | | 28,228 | | | | | 28,228 | | | Marketable securities: | | | | | | | | | Commercial paper | — | | | 415,103 | | | | | 415,103 | | | Corporate notes and bonds | — | | | 1,586,235 | | | | | 1,586,235 | | | Certificates of deposit | — | | | 20,098 | | | | | 20,098 | | | U.S. government and agency securities | — | | | 260,733 | | | | | 260,733 | | | | | | | | | | | Total | $ | 489,607 | | | $ | 2,384,034 | | | | | $ | 2,873,641 | |
The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis as of December 31, 2019 (in thousands): | | | | | | | | | | | | | | | | | | | Level 1 | | Level 2 | | Total | | Cash equivalents: | | | | | | | Money market funds | $ | 486,982 | | | $ | — | | | $ | 486,982 | | | Commercial paper | — | | | 86,388 | | | 86,388 | | | | | | | | | | | | | | | | | | | | | Marketable securities: | | | | | | | Commercial paper | — | | | 101,490 | | | 101,490 | | | Corporate notes and bonds | — | | | 1,661,330 | | | 1,661,330 | | | Certificates of deposit | — | | | 38,045 | | | 38,045 | | | U.S. government and agency securities | — | | | 127,784 | | | 127,784 | | | | | | | | | Total | $ | 486,982 | | | $ | 2,015,037 | | | $ | 2,502,019 | |
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