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Sumitomo Transaction Agreement - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 27, 2019 | Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | May 31, 2021
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Gain (loss) on sale of stock transactions |  |  |  |  |  | $ (43,398) |
Escrow amount | $ 75,000 |  |  |  |  |  |
Restricted cash | $ 86,632 |  |  | $ 11,644 |  | 86,045 |
Gain on termination of Sumitomo Options |  |  |  | 66,472 | $ 0 |  |
Transition Services And Strategic Cooperation Agreement [Member] |  |  |  |  |  |  |
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Transition and cooperation agreement billed amount,Net of amounts billed by sumitovant |  |  |  | 300 | $ 400 |  |
Asset Purchase Agreement [Member] |  |  |  |  |  |  |
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Consideration received in cash |  |  |  |  |  |  | $ 5,000
Gain on termination of Sumitomo Options |  |  |  | 66,500 |  |  |
Sumitomo [Member] |  |  |  |  |  |  |
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Percentage of granted option to purchase ownership interest | 75.00% | 75.00% |  |  |  |  |
Number of shares transferred |  |  | 26,952,143 |  |  |  |
Consideration received in transaction |  |  | $ 999,200 |  |  | 2,900,000 |
Gain (loss) on sale of stock transactions |  |  |  |  |  | $ 2,000,000 |
Escrow amount |  | $ 75,000 | 75,000 |  |  |  |
Restricted cash | $ 75,000 |  | 75,000 |  |  |  |
Sale Of Stock Consideration Cash Received On Transaction |  |  | 2,900,000 |  |  |  |
Stock offer to repurchase during period value of the proceeds received from transaction agreement |  |  |  | $ 1,000,000 |  |  |
Sumitomo [Member] | Employee [Member] |  |  |  |  |  |  |
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Aggregate fair value of issued instruments to employees on transaction |  |  | 39,100 |  |  |  |
Deferred compensation equity |  |  | 24,800 |  |  |  |
Deferred compensation liability |  |  | 14,300 |  |  |  |
Outstanding instruments vest based on the achievement of time-based, performance or liquidity event requirements | 1,865,416 |  |  | 1,863,451 | 1,873,480 | 1,880,980 |
Sumitomo [Member] | Maximum |  |  |  |  |  |  |
Transaction Agreement [Line Items] |  |  |  |  |  |  |
Repurchase of RSL's equity securities approved amount |  |  | $ 1,000,000 |  |  |  |

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