Out-License of Marqibo, Zevalin, and Evolema in China Territory to CASI - Schedule of Proceeds Received and Fair Value on CASI Out-License Execution Date (Detail) - CASI Out-License [Member] $ in Thousands	Sep. 17, 2014 USD ($)
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