Out-License of Marqibo, Zevalin, and Evomela in China Territory - Schedule of Proceeds Received and Fair Value on CASI Out-License Execution Date (Detail) - USD ($) $ / shares in Units, shares in Millions		9 Months Ended	12 Months Ended
	Sep. 17, 2014	Sep. 30, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Fair value		$ 17,751,000	$ 11,533,000
Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Debt instrument face value	$ 1,500,000
CASI Out-License [Member]
Other Commitments [Line Items]
Total consideration received	$ 9,959,000
Shares received (shares)	5.4	10.0	4.6
Share price ($ per share)	$ 1.6
CASI Out-License [Member] | Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Total consideration received	$ 1,310,000
Debt instrument coupon rate	0.50%
CASI Out-License [Member] | Common Stock [Member]
Other Commitments [Line Items]
Total consideration received	$ 8,649,000
Fair value		$ 17,800,000