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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIIES (Tables) | 12 Months Ended
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Dec. 31, 2021
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:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Biogen MA, Inc. | 38 | % |  | 24 | % |  | — |
Novartis Institutes for BioMedical Research, Inc. | 34 | % |  | 4 | % |  | — |
Kite Pharma, Inc. | 23 | % |  | 24 | % |  | 34 | %
Sanofi S.A. | 3 | % |  | 5 | % |  | 22 | %
Pfizer Inc. | — | % |  | 40 | % |  | 40 | %
Schedules of Percentage of Accounts Receivable by Collaboration Partners | As of December 31, 2021 and 2020, the percentage of accounts receivable by collaboration partners who individually accounted for 10% or more of accounts receivable were as follows:
| As of December 31,
| 2021 |  | 2020
Biogen MA, Inc. | 46 | % |  | 52 | %
Novartis Institutes for BioMedical Research, Inc. | 32 | % |  | 21 | %
Sanofi S.A. | 11 | % |  | 19 | %
Schedule of Cash and Cash Equivalents | A reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying Consolidated Balance Sheets to the amounts reported within the accompanying Consolidated Statements of Cash Flows is as follows (in thousands):
| As of December 31,
| 2021 |  | 2020 |  | 2019 |  |
Cash and cash equivalents | $ | 178,872 |  |  | $ | 131,329 |  |  | $ | 80,428 |  |  |
Non-current restricted cash | 1,500 |  |  | 1,500 |  |  | 1,500 |  |  |
Cash, cash equivalents, and restricted cash as reported within the Consolidated Statements of Cash Flows | $ | 180,372 |  |  | $ | 132,829 |  |  | $ | 81,928 |  |  |
Restrictions on Cash and Cash Equivalents | A reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying Consolidated Balance Sheets to the amounts reported within the accompanying Consolidated Statements of Cash Flows is as follows (in thousands):
| As of December 31,
| 2021 |  | 2020 |  | 2019 |  |
Cash and cash equivalents | $ | 178,872 |  |  | $ | 131,329 |  |  | $ | 80,428 |  |  |
Non-current restricted cash | 1,500 |  |  | 1,500 |  |  | 1,500 |  |  |
Cash, cash equivalents, and restricted cash as reported within the Consolidated Statements of Cash Flows | $ | 180,372 |  |  | $ | 132,829 |  |  | $ | 81,928 |  |  |

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