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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Biogen MA, Inc. (Detail) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) product_target $ / shares shares | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($)
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Accounts receivable |  |  | $ 4,522 |  | $ 4,522 |  |  | $ 6,013
Biogen MA, Inc. | Stock purchase agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Standstill restriction period |  | 3 years |  |  |  |  |  |
Standstill restriction, ownership threshold percentage ownership percentage |  | 5.00% |  |  |  |  |  |
Collaborative arrangement transaction price |  | $ 204,600 |  |  |  |  |  |
Excess consideration received on transaction |  | 79,600 |  |  |  |  |  |
Collaboration agreement, equity issued |  | 145,400 |  |  |  |  |  |
Accounts receivable |  |  | 1,700 |  | 1,700 |  |  | 2,800
Deferred revenue |  |  | 132,100 |  | 132,100 |  |  | $ 154,000
Recognized portion of equity issued |  |  |  |  |  |  | $ 2,900 |
Biogen MA, Inc. | Collaboration And License Agreement |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Consideration received on transaction |  | 204,600 |  |  |  |  |  |
Proceeds from collaborators | $ 125,000 | 125,000 |  |  |  |  |  |
Maximum milestone payment receivable |  | $ 2,400,000 |  |  |  |  |  |
Number of additional product targets | product_target |  | 7 |  |  |  |  |  |
Remaining period |  | 5 years |  |  |  |  |  |
Number of product targets selected | product_target |  | 3 |  |  |  |  |  |
Research period |  | 7 years |  |  |  |  |  |
Maximum number of product targets replaced | product_target |  | 10 |  |  |  |  |  |
Financial advisory fees |  |  |  |  |  |  | $ 7,000 |
Percent of initial recognition |  | 2.00% |  |  |  |  |  |
Portion of contract asset recognized |  |  | 4,100 |  | 4,100 |  |  |
Amortization |  |  | $ 100 | $ 100 | $ 400 | $ 400 |  |
Biogen MA, Inc. | Collaboration And License Agreement | Pre-approval milestone |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Maximum milestone payment receivable |  | $ 925,000 |  |  |  |  |  |
Biogen MA, Inc. | Collaboration And License Agreement | Sales-based milestone |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |
Maximum milestone payment receivable |  | $ 1,500,000 |  |  |  |  |  |

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