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Inventory, Net.- Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Inventory Disclosure [Abstract]
Inventory unsalable product			$ 500,000
Inventory reserve	$ 200,000	$ 0	$ 400,000	$ 0

X

- Definition

Inventory reserve.

+ References

No definition available.

+ Details

Name:	cprx_InventoryReserve
Namespace Prefix:	cprx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Inventory write down expected to be reimbursed.

+ References

No definition available.

+ Details

Name:	cprx_InventoryWriteDownExpectedToBeReimbursed
Namespace Prefix:	cprx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InventoryDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration