Casi Holdings and Evomela Supply Contract - Additional Information (Details) $ in Thousands, shares in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($) agreement shares	Dec. 31, 2018 USD ($)
Other Commitments [Line Items]
Mutual funds		$ 31,047	$ 46,422
CASI Out License
Other Commitments [Line Items]
Number of agreements | agreement		3
Number of shares held in investment (shares) | shares		10.0
Percentage of ownership		10.30%
Mutual funds		$ 31,000
Number of shares issued in transaction (shares) | shares	1.5
Consideration received in sale of stock	$ 5,100
Realized gain on equity securities	$ 2,700