Out-License of Marqibo, Zevalin, & Evolema in China Territory - Schedule of Proceeds Received and Fair Value on CASI Out-License Execution Date (Detail) (CASI Out-License [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Sep. 17, 2014
Other Commitments [Line Items]
Total consideration received	$ 9,959
Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Total consideration received	1,310
Common Stock [Member]
Other Commitments [Line Items]
Total consideration received	$ 8,649