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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Summary of Financial Instruments Measured at Fair Value on Recurring Basis | The following tables set forth the Company’s financial assets and liabilities that were measured at fair value on a recurring basis as of the dates indicated by level within the fair value hierarchy (in thousands):
| December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |
Unrestricted cash equivalents and investments(1) |  |  |  |  |  |  |
Money market funds | $ | 3,276 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,276 |
Certificates of deposit | — |  |  | 502,159 |  |  | — |  |  | 502,159 |
Commercial paper | — |  |  | 963,150 |  |  | — |  |  | 963,150 |
Corporate bonds | — |  |  | 61,501 |  |  | — |  |  | 61,501 |
U.S. government securities | — |  |  | 7,060 |  |  | — |  |  | 7,060 |
Total unrestricted cash equivalents and short-term investments | 3,276 |  |  | 1,533,870 |  |  | — |  |  | 1,537,146 |
Restricted cash equivalents and investments(2) |  |  |  |  |  |  |
Money market funds | 93,362 |  |  | — |  |  | — |  |  | 93,362 |
Certificates of deposit | — |  |  | 354,978 |  |  | — |  |  | 354,978 |
Commercial paper | — |  |  | 595,591 |  |  | — |  |  | 595,591 |
Corporate bonds | — |  |  | 14,916 |  |  | — |  |  | 14,916 |
U.S. government securities | — |  |  | 74,534 |  |  | — |  |  | 74,534 |
Total restricted cash equivalents and investments | 93,362 |  |  | 1,040,019 |  |  | — |  |  | 1,133,381 |
Marketable equity securities(3) | 1,136 |  |  | — |  |  | — |  |  | 1,136 |
Total financial assets | $ | 97,774 |  |  | $ | 2,573,889 |  |  | $ | — |  |  | $ | 2,671,663 |
Liabilities |  |  |  |  |  |  |
Contingent consideration(4) | $ | — |  |  | $ | — |  |  | $ | 15,000 |  |  | $ | 15,000 |
Total financial liabilities | $ | — |  |  | $ | — |  |  | $ | 15,000 |  |  | $ | 15,000 |
_______________ (1)$126.5 million of cash, $127.0 million of money market deposit accounts and $5.0 million of term deposits are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $1.8 billion of cash and cash equivalents and short-term investments on the consolidated balance sheets. (2)$1.3 million of restricted cash and $3.5 million of a restricted term deposit are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $1.1 billion of restricted cash and cash equivalents and restricted short-term investments on the consolidated balance sheets. (3)Included in other investments on the consolidated balance sheets. (4)In the second quarter of 2022, the Company completed the acquisition of PBSC which included up to $15.0 million in contingent consideration to be paid over the next year. The contingent consideration was classified as a liability and included in accrued and other current liabilities on the consolidated balance sheets. Refer to Note 3 "Acquisitions" to the consolidated financial statements for information regarding this contingent consideration.
| December 31, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
Unrestricted Balances(1) |  |  |  |  |  |  |
Money market funds | $ | 22,250 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,250 |
Certificates of deposit | — |  |  | 505,438 |  |  | — |  |  | 505,438 |
Commercial paper | — |  |  | 806,388 |  |  | — |  |  | 806,388 |
Corporate bonds | — |  |  | 99,705 |  |  | — |  |  | 99,705 |
Total unrestricted cash equivalents and short-term investments | 22,250 |  |  | 1,411,531 |  |  | — |  |  | 1,433,781 |
Restricted Balances(2) |  |  |  |  |  |  |
Money market funds | 20,161 |  |  | — |  |  | — |  |  | 20,161 |
Certificates of deposit | — |  |  | 421,144 |  |  | — |  |  | 421,144 |
Commercial paper | — |  |  | 523,489 |  |  | — |  |  | 523,489 |
Corporate bonds | — |  |  | 63,458 |  |  | — |  |  | 63,458 |
U.S. government securities | — |  |  | 31,717 |  |  | — |  |  | 31,717 |
Total restricted cash equivalents and investments | 20,161 |  |  | 1,039,808 |  |  | — |  |  | 1,059,969 |
Total unrestricted and restricted cash equivalents and investments | $ | 42,411 |  |  | $ | 2,451,339 |  |  | $ | — |  |  | $ | 2,493,750 |
_______________ (1)$104.8 million of cash, $330.3 million of money market deposit accounts and $385.0 million of term deposits are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $2.3 billion of cash and cash equivalents and short-term investments on the consolidated balance sheets. (2)$53.7 million of restricted cash and $5.0 million of a restricted term deposit are not subject to recurring fair value measurement and therefore excluded from this table. However, these balances are included within the $1.1 billion of restricted cash and cash equivalents and restricted short-term investments on the consolidated balance sheets.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table provides a reconciliation of the beginning balances of the Level 3 financial assets (in thousands):
| Year Ended December 31,
| 2022 |  | 2021
Balance at beginning of period | $ | 80,411 |  |  | $ | 10,000 |
Additions(1) | 64,044 |  |  | 70,260 |
Change in fair value(2) | (138,552) |  |  | 151 |
Balance at end of period | $ | 5,903 |  |  | $ | 80,411 |
_______________ (1)Relates to non-marketable equity securities included in other investments on the consolidated balance sheets. (2)Includes a $128.1 million impairment related to an investment in the non-marketable equity security due to the announced winding down of the equity investee in the third quarter of 2022 and a $10.0 million reduction in securities in a privately-held company related to an exchange of securities in a privately-held entity following its acquisition. The impairment charge was recorded to other income (expense), net on the consolidated statement of operations.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following table provides a reconciliation of the beginning balances of the Level 3 financial liabilities (in thousands):
| Year Ended December 31,
| 2022 |  | 2021
Balance at beginning of period | $ | — |  |  | $ | — |
Additions(1) | 14,100 |  |  | — |
Change in fair value | 900 |  |  | — |
Balance at end of period | $ | 15,000 |  |  | $ | — |
_______________ (1)Relates the contingent consideration from the acquisition of PBSC, which are included in accrued and other current liabilities on the consolidated balance sheets. Refer to Note 3 "Acquisitions" to the consolidated financial statements for information regarding this contingent consideration.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19279-110258 + Details
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