Leases - (Details) $ in Thousands, ¥ in Millions	1 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2019 USD ($) m²	Nov. 30, 2019 CNY (¥) m²	Jun. 30, 2022 USD ($) lease	Jun. 30, 2021 USD ($)	Dec. 31, 2021 lease
Rent expenses			$ 700	$ 800
Number of operating lease | lease			9		8
Weighted average remaining lease term			37 years 1 month 24 days		36 years 5 months 19 days
Weighted average discount rates			3.53%		3.56%
Variable lease costs			$ 0	0
Sublease income			$ 0	$ 0
CASI Wuxi
Term of lease contract	50 years	50 years
Land parcel area (in square meters) | m²	74,028.40	74,028.40
Prepaid lease payments for the land use right	$ 6,500	¥ 45