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Revenue - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 17, 2020 | Aug. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Aug. 31, 2019 | Nov. 30, 2018 | Mar. 31, 2022 | Mar. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | $ 9,294,000 | $ 7,323,000
Ocumension Therapeutics [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Receipt of upfront license fee |  |  | $ 9,500,000 | $ 2,000,000.0 |  |  | $ 1,750,000 |  |
Potential future payments based on achievement of development and regulatory milestones |  |  | 6,000,000.0 |  | $ 6,000,000.0 |  |  | 7,250,000 |
Potential future payments based on achievement of commercial-based milestones |  |  | 6,000,000.0 |  | $ 6,000,000.0 |  |  | 3,000,000.0 |
Development milestone payment received |  |  |  |  |  | $ 1,000,000.0 |  |  |
Potential future payments based on achievement of combined remaining development and sales milestone |  |  | 11,750,000 |  |  |  |  |  |
Potential future payments based on achievement of remaining development and regulatory milestones |  |  | 6,250,000 |  |  |  |  |  |
Potential future payments based on achievement of remaining commercial-based milestones |  |  | 3,000,000.0 |  |  |  |  |  |
Ocumension Therapeutics [Member] | Share Offering [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Issuance of stock, net of issue costs, shares | 3,010,722 |  |  |  |  |  |  |  |
Ocumension Therapeutics [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Product supply milestones and development milestones |  |  |  |  |  |  |  | 7,250,000 |
Upon achievement of milestones |  |  | $ 21,250,000 |  |  |  |  |  |
RPA [Member] | SWK [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Upfront cash payment |  | $ 16,500,000 |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 225,000 | 180,000
Royalty payments |  |  |  |  |  |  |  | 724,000 | 583,000
Royalty Sale Agreement [Member] | SWK [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Deferred revenue |  | $ 16,500,000 |  |  |  |  |  |  |
Deferred revenue, current |  |  |  |  |  |  |  | 1,100,000 | 1,100,000
Deferred revenue, non-current |  |  |  |  |  |  |  | 14,300,000 | 14,600,000
Product [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 9,010,000 | 6,802,000
Product [Member] | Ocumension Therapeutics [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 56,000 | 5,000
License and Collaboration Revenue [Member] | Ocumension Therapeutics [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | 59,000 | 268,000
Collaborative Research and Development [Member] |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  | $ 0 | $ 60,000

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