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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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