The amount committed to be invested in fixed assets by the company.

No definition available.

Name:	casi_FixedAssetsInvestmentCommitmentAmount
Namespace Prefix:	casi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This represents amount committed to be invested in land use right and property, plant and equipment by the company.

+ References

No definition available.

+ Details

Name:	casi_LandUseRightAndPropertyPlantAndEquipmentCommitmentAmount
Namespace Prefix:	casi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Accrued milestone payment under license agreement.

+ References

No definition available.

+ Details

Name:	casi_LicenseAgreementAccruedMilestonePayment
Namespace Prefix:	casi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of milestone payment under license agreement.

+ References

No definition available.

+ Details

Name:	casi_LicenseAgreementMilestonePayment
Namespace Prefix:	casi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of milestones achieved.

+ References

No definition available.

+ Details

Name:	casi_NumberMilestonesAchieved
Namespace Prefix:	casi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of milestone payments yet to be paid.

+ References

No definition available.

+ Details

Name:	casi_NumberMilestonesPaymentsOutstanding
Namespace Prefix:	casi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=casi_CASIWuxiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	casi_InvestmentsContractCounterpartyAxis=casi_CleaveTherapeuticsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	casi_InvestmentsContractCounterpartyAxis=casi_BioinventInternationalAbMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	casi_InvestmentsContractCounterpartyAxis=casi_BlackBeltTherapeuticsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	casi_InvestmentsContractCounterpartyAxis=casi_PharmathenGlobalBvMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Details) ¥ in Millions	1 Months Ended					9 Months Ended
Commitments and Contingencies (Details) ¥ in Millions	Aug. 31, 2021 USD ($)	Aug. 31, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 CNY (¥)	Sep. 30, 2022 USD ($) Milestone	Sep. 30, 2021 USD ($)	Sep. 30, 2022 CNY (¥)	Aug. 31, 2021 EUR (€)
Payment for property improvements \| $						$ 2,186,000	$ 3,730,000
CASI Wuxi
Fixed assets investment, commitment amount						8,300,000		¥ 59.2
Land use right and property, plant and equipment, commitment amount				$ 143,000,000	¥ 1,000.0
CASI Wuxi \| Building
Contractual obligation						$ 24,500,000		¥ 174.5
Cleave Therapeutics, Inc
Number of milestones achieved						0
BioInvent International AB
Number of milestones achieved						0
Black Belt Therapeutics Ltd
Number of milestones achieved						0
Milestone payment	$ 305,000	€ 250,000	$ 750,000
Accrued milestone payment	$ 305,000								€ 250,000
Pharmathen Global BV
Number of milestone payments yet to be paid						1