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Long-Term Debt and Loan Commitment - Additional Information (Detail) - USD ($) |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2021 | May 31, 2021 | Jan. 31, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | May 31, 2019 | Oct. 31, 2018 | Aug. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  | $ 20,000,000.0 |  | $ 20,000,000.0 |  |
Debt interest rate |  |  |  |  |  |  | 9.95% |  |
Debt Instrument, Fee Amount |  |  |  | $ 4,000.0 |  | $ 1,400,000 | $ 1,400,000 |  |
Debt Instrument Exit Fee And End Of Term Charge |  |  |  | 5,000,000 | 1,390,000 |  | $ 5,000.0 |  |
Proceed from equity and debt financing |  |  | $ 110,000,000.0 |  |  |  |  |  |
Proceeds from credit facility | $ 40,000,000.0 | $ 40,000,000.0 |  |  |  |  |  |  |
Interest rate | 10.00% |  |  |  |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |  |  |  |
Class of warrants or rights number of shares called by each warrant or right |  | 1,199,072 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price per share |  | $ 0.01 |  |  |  |  |  |  |
Revenue Interest Purchase and Sale Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Securities Purchased under Agreements to Resell |  | $ 160,000,000.0 |  |  |  |  |  |  |
Minimum Amount of Annual Net Sales To Qualify Under Revenue Interest Purchase Agreement, Contingent Threshold |  | $ 160,000,000.0 |  |  |  |  |  |  |
Prime Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  | 4.45% |  |
NovaQuest Agreement [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt principal amount |  |  |  |  |  |  |  | $ 17,500,000 | $ 100,000,000.0
Debt fair value |  |  |  | $ 155,200,000 | 150,100,000 | $ 89,100,000 |  |  |
NovaQuest Agreement [Member] | Regulatory Milestone [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount required milestone payments |  |  |  |  | 440,600,000 |  |  |  | 440,600,000
Possible offset of regulatory milestone payments with commercial milestone |  |  |  |  | 88,100,000 |  |  |  | 88,100,000
NovaQuest Agreement [Member] | Commercial Milestone [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount required milestone payments |  |  |  |  | $ 141,000,000.0 |  |  |  | $ 141,000,000.0

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