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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Sanofi S.A. (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 102 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 06, 2022 USD ($) | Jan. 31, 2014 USD ($) program | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) product milestone | Jun. 30, 2022 USD ($) | Jun. 28, 2022 USD ($) | Dec. 31, 2022 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  | $ 6,835,000 | $ 29,378,000 | $ 164,792,000 | $ 57,609,000 |  |
Accounts receivable |  |  | 2,716,000 |  | 2,716,000 |  |  | $ 3,678,000
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Decrease in research and development expense |  |  | 700,000 |  | 1,300,000 |  |  |
Sanofi S.A. |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Number of research programs | program |  | 2 |  |  |  |  |  |
Revenues under agreement |  | $ 20,000,000 |  |  |  |  |  |
Revenues |  |  | 0 | $ 1,800,000 | $ 0 | $ 3,300,000 | $ 13,500,000 |
Number of products approved | product |  |  |  |  | 0 |  |  |
Expenses reimbursable through December 31, 2023 (up to) | $ 7,000,000 |  |  |  |  |  |  |
Expenses reimbursable after December 31, 2023 (up to) | $ 5,300,000 |  |  |  |  |  |  |
Sanofi S.A. | Collaboration And License Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Revenues under agreement |  |  |  |  |  |  | 20,000,000 |
Number of milestones included in transaction price | milestone |  |  |  |  | 0 |  |  |
Collaborative arrangement transaction price |  |  |  |  |  |  | 96,300,000 |
Collaborative arrangement estimated reimbursable service costs |  |  |  |  |  |  | 62,800,000 |
Accounts receivable |  |  | 0 |  | $ 0 |  |  | 0
Contract with customer liability |  |  | $ 0 |  | $ 0 |  |  | $ 0
Sanofi S.A. | Collaboration And License Agreement | Milestone Three |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Milestone revenue receivable |  |  |  |  |  |  | $ 13,500,000 |

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