Fair Value Measurements (Details Textual)	1 Months Ended
Oct. 31, 2017 USD ($)
Subsequent Event [Member]
Adjustments to Additional Paid in Capital, Stock Issued	$ 2,762,979

Represents the changes in additional paid in capital due to issuance of new common stock.

No definition available.

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