Accounts Receivable - Additional Information (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($) Distributor	Dec. 31, 2023 USD ($) Distributor
Accounts Receivable [Line Items]
Number of wholesale distributors \| Distributor		3	3
Percentage of gross sales from major wholesale distributors	71.00%	70.00%
Allowance for credit losses and doubtful accounts	$ 0	$ 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	$ 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	84.00%	84.00%
Allowance for credit losses and doubtful accounts	$ 157,000	$ 157,000	$ 157,000
Accounts receivable	$ 22,270,000	$ 22,270,000	$ 20,199,000

Number of wholesale distributors.

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Percentage of accounts receivable from major customers.

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Percentage of collaborations and services net accounts receivables.

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Percentage of revenue from major customers collaborations and services.

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Percentage of sales from major customers.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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