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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Tables) | 3 Months Ended
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Mar. 31, 2022
Accounting Policies [Abstract] |
Schedule of Revenue from Strategic Partnering Collaboration Agreements and Research Activity Grants as a Percentage of Total Revenues | Revenues from major collaboration agreements and research activity grants as a percentage of total revenues were as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2022 |  | 2021
Biogen MA, Inc. |  |  |  |  | 40 | % |  | 40 | %
Novartis Institutes for BioMedical Research, Inc. |  |  |  |  | 32 | % |  | 30 | %
Kite Pharma, Inc. |  |  |  |  | 22 | % |  | 24 | %
Sanofi S.A. |  |  |  |  | 5 | % |  | 4 | %
Schedule of Cash and Cash Equivalents | A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows is as follows (in thousands):
| March 31, 2022 |  | December 31, 2021 |  | March 31, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 120,257 |  |  | $ | 178,872 |  |  | $ | 122,975 |  |  | $ | 131,329 |
Non-current restricted cash | 1,500 |  |  | 1,500 |  |  | 1,500 |  |  | 1,500 |
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 121,757 |  |  | $ | 180,372 |  |  | $ | 124,475 |  |  | $ | 132,829 |
Restrictions on Cash and Cash Equivalents | A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows is as follows (in thousands):
| March 31, 2022 |  | December 31, 2021 |  | March 31, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 120,257 |  |  | $ | 178,872 |  |  | $ | 122,975 |  |  | $ | 131,329 |
Non-current restricted cash | 1,500 |  |  | 1,500 |  |  | 1,500 |  |  | 1,500 |
Cash, cash equivalents, and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 121,757 |  |  | $ | 180,372 |  |  | $ | 124,475 |  |  | $ | 132,829 |

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