Commitments (Details) - CASI Wuxi [Member]	1 Months Ended
Nov. 30, 2019 CNY (¥)	Nov. 30, 2019 USD ($)	Aug. 27, 2020 CNY (¥)	Aug. 27, 2020 USD ($)
Land use right and property, plant and equipment, commitment amount	¥ 1,000,000,000	$ 143,000,000
Estimated construction period	3 years	3 years
Construction project contract amount			¥ 74,588,000	$ 10,923,000

Threshold period within which the company has to make the fixed assets investment, from the date of establishment of the company, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	casi_FixedAssetsInvestmentThresholdPeriod
Namespace Prefix:	casi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration