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Investments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2017 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2020
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock Owned, Balance, Shares of Arbutus |  | 16,013,540 | 16,013,540 |  |  | 16,013,540 |  |  |  |
Preferred stock Owned, Balance, Shares of Arbutus |  | 1,164,000 | 1,164,000 |  |  | 1,164,000 |  |  |  |
Aggregate fair value investment |  | $ 180,359 | $ 188,978 |  |  | $ 188,978 | $ 93,445 |  |  |
Preferred stock issued and sold |  |  |  |  |  |  |  | 639,140 | 639,140 | 13,411,311
Carrying value of long-term investment |  | $ 100,563 | $ 100,563 |  |  | $ 100,563 | $ 0 |  |  |
Common stock |  | 222,669,799 | 222,669,799 |  |  | 222,669,799 | 214,879,058 |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock issued and sold |  |  |  |  |  |  |  |  | 13,411,311 |
Other Investments [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate fair value investment |  | $ 11,900 | $ 11,100 |  |  | $ 11,100 | $ 8,900 |  |  |
Arbutus Biopharma Corporation [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Premium on the conversion price, percentage | 15.00% |  |  |  |  |  |  |  |  |
Annual compounded conversion rate for preferred share |  | 8.75% | 8.75% |  |  | 8.75% |  |  |  |
Conversion price |  | $ 7.13 | $ 7.13 |  |  | $ 7.13 |  |  |  |
Closing price | $ 6.20 |  |  |  |  |  |  |  |  |
Ownership interest, percentage |  |  |  |  | 49.90% |  |  |  |  |
Maximum allowed ownership interest percentage |  |  |  |  | 49.99% |  |  |  |  |
Aggregate fair value investment |  | $ 117,700 | $ 129,400 |  |  | $ 129,400 | 39,200 |  |  |
Unrealized gain (loss) on investments |  | $ (11,700) |  | $ 31,500 |  | $ 90,200 | $ 99,900 |  |  |
Closing price of common stock |  | $ 3.03 | $ 3.33 |  |  | $ 3.33 | $ 1.01 |  |  |
Equity method investment ownership percentage |  | 32.00% |  |  |  |  |  |  |  |
Common stock |  |  | 16,013,540 |  |  | 16,013,540 | 16,013,540 |  |  |
Preferred stock |  |  | 1,164,000 |  |  | 1,164,000 | 1,164,000 |  |  |
Sio Gene Therapies Inc [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest, percentage |  | 27.00% |  |  |  |  |  |  |  |
Aggregate fair value investment |  | $ 50,700 | $ 48,500 |  |  | $ 48,500 | $ 45,300 |  |  |
Unrealized gain (loss) on investments |  | $ 2,200 |  | 7,100 |  | $ 3,200 | $ 31,600 |  |  |
Closing price of common stock |  | $ 2.73 | $ 2.61 |  |  | $ 2.61 | $ 2.44 |  |  |
Gain on deconsolidation |  |  |  |  |  |  | $ 107,300 |  |  |
Datavant Holdings, Inc [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate fair value investment |  | $ 99,000 | $ 99,000 |  |  | $ 99,000 |  |  |  |
Gain on deconsolidation |  |  |  | $ 86,500 |  | 86,500 |  |  |  |
Carrying value of long-term investment |  | $ 100,600 | $ 100,600 |  |  | $ 100,600 |  |  |  |
Datavant Holdings, Inc [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of stock |  |  |  |  |  |  |  |  | $ 27,200 | $ 27,200
Preferred stock issued and sold |  |  |  |  |  |  |  |  | 1,065,234 | 1,065,234
Total purchase price |  |  |  |  |  |  |  |  |  | $ 2,500
Issued relating to the conversion of certain liability instruments |  |  |  |  |  |  |  |  |  | 1,800,253

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