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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - Biogen MA, Inc. (Detail) - Biogen MA, Inc. | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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May 31, 2020 USD ($) | Apr. 30, 2020 USD ($) $ / shares shares | Feb. 29, 2020 USD ($) product_target | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) product_target | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
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 |  |  |  |  |  |  |  |  | $ 225,000,000
Standstill restriction period |  |  | 3 years |  |  |  |  |  |
Standstill restriction, ownership threshold percentage ownership percentage |  |  | 5.00% |  |  |  |  |  |
Agreement restriction, percentage of shares held |  |  | 50.00% |  |  |  |  |  |
Voting provisions expiration period |  |  | 2 years |  |  |  |  |  |
Voting provisions, ownership threshold percentage |  |  | 5.00% |  |  |  |  |  |
Collaborative arrangement transaction price |  | $ 204,600,000 |  |  |  |  |  |  |
Excess consideration received on transaction |  |  |  |  | $ 79,600,000 |  |  |  |
Collaboration agreement, equity issued |  |  |  |  |  |  |  |  | 145,400,000
Deferred revenue |  |  |  | $ 161,300,000 |  |  | $ 161,300,000 |  | 183,200,000
Recognized portion of equity issued |  |  |  |  |  |  |  |  | 2,900,000
Collaboration And License Agreement |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |
Consideration received on transaction |  |  |  |  |  |  |  |  | 204,600,000
Proceeds from collaborators | $ 125,000,000 |  |  |  |  |  |  |  | 125,000,000
Maximum milestone payment receivable |  |  | $ 2,370,000,000 |  |  |  |  |  |
Number of product targets | product_target |  |  | 12 |  |  |  |  |  |
Number of additional product targets | product_target |  |  | 9 |  |  |  |  |  |
Target selection 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 |  |  |  |  |  |  |  |  | $ 7,000,000
Percent of initial recognition |  |  |  |  |  |  |  |  | 2.00%
Portion of contract asset recognized |  |  |  |  |  |  |  |  | $ 4,100,000
Amortization |  |  |  | $ 100,000 |  | $ 100,000 | $ 400,000 | $ 300,000 |
Collaboration And License Agreement | Pre-approval milestone |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |
Maximum milestone payment receivable |  |  | $ 925,000,000 |  |  |  |  |  |
Collaboration And License Agreement | Sales-based milestone |  |  |  |  |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |  |  |  |  |
Maximum milestone payment receivable |  |  | $ 1,450,000,000 |  |  |  |  |  |

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