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Accounts Receivable - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) Distributor | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) Distributor
Accounts Receivable [Line Items] |  |  |
Number of wholesale distributors | Distributor | 3 |  | 3
Percentage of gross sales from major wholesale distributors | 70.00% |  |
Allowance for credit losses and doubtful accounts | $ 0 |  | $ 0
Percentage of revenue from major customers collaborations and services | 100.00% | 100.00% |
Zealand Pharma US |  |  |
Accounts Receivable [Line Items] |  |  |
Allowance for credit losses and doubtful accounts | $ 200,000 |  | $ 200,000
Accounts receivable | $ 200,000 | $ 200,000 |
United Therapeutics Corporation |  |  |
Accounts Receivable [Line Items] |  |  |
Percentage of collaborations and services net accounts receivables | 100.00% |  | 100.00%
Commercial product sales |  |  |
Accounts Receivable [Line Items] |  |  |
Percentage of accounts receivable from major wholesale distributors | 78.00% |  |
Allowance for credit losses and doubtful accounts | $ 157,000 |  | $ 157,000
Accounts receivable | $ 17,516,000 |  | $ 20,199,000

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