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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Biogen MA, Inc. (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) product_target $ / shares shares | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Number of additional neurological disease gene targets (in product targets) | product_target |  | 7 |  |  |  |  |  |
Accounts receivable |  |  | $ 2,716 |  | $ 2,716 |  | $ 3,678 |
General and administrative expense |  |  | 16,014 | $ 15,093 | 34,150 | $ 30,001 |  |
Biogen MA, Inc. |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Change in estimate of transaction price, increase in revenue |  |  |  |  | 127,100 |  |  |
Biogen MA, Inc. | License and Service |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Fixed consideration |  | $ 204,600 |  |  |  |  |  |
Remaining performance obligation amount |  |  | 0 |  | 0 |  | 151,300 |
General and administrative expense |  |  | 30 | $ 100 | 2,600 | $ 300 |  |
Biogen MA, Inc. | Stock Purchase Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  | 24,420,157 |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  | $ 9.2137 |  |  |  |  |  |
Consideration received on transaction |  | $ 225,000 |  |  |  |  |  |
Sale of stock, excess consideration received on transaction |  | 79,600 |  |  |  |  |  |
Collaboration agreement, equity issued |  | 145,400 |  |  |  |  |  |
Accounts receivable |  |  | 400 |  | 400 |  | 500 |
Deferred revenue |  |  | 0 |  | 0 |  | $ 132,200 |
Biogen MA, Inc. | Collaboration And License Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Proceeds from collaborators | $ 125,000 | $ 125,000 |  |  |  |  |  |
Number of neurological disease gene targets selected by counterparty (in product targets) | product_target |  | 4 |  |  |  |  |  |
Financial advisory fees |  |  |  |  |  |  |  | $ 7,000
Percent of initial recognition |  | 2.00% |  |  |  |  |  |
Contract with customer, asset, after allowance for credit Loss |  |  | $ 4,100 |  | $ 4,100 |  |  |

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