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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 | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) product_target $ / shares shares | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) material_right
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |
Accounts receivable |  |  | $ 7,026 |  |  | $ 3,678
General and administrative expense |  |  | 18,136 | $ 14,908 |  |
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 |  |  |  |
Number of material rights expired | material_right |  |  |  |  |  | 1
Number of material rights outstanding | material_right |  |  |  |  |  | 7
Remaining performance obligation amount |  |  | 1,700 |  |  | $ 151,300
General and administrative expense |  |  | 2,600 | $ 100 |  |
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 |  |  | 700 |  |  | 500
Deferred revenue |  |  | 1,500 |  |  | $ 132,200
Net pension losses |  |  |  |  | $ 2,900 |
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 |  |  |  |
Number of additional neurological disease gene targets (in product targets) | product_target |  | 7 |  |  |  |
Financial advisory fees |  |  |  |  | $ 7,000 |
Percent of initial recognition |  | 2.00% |  |  |  |
Contract with customer, asset, after allowance for credit Loss |  |  | $ 4,100 |  |  |

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