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) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended		9 Months Ended
	Sep. 17, 2014	Jul. 31, 2016	Feb. 29, 2016	Sep. 30, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Fair value				$ 9,146,000	$ 6,689,000
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	1.1	1.7	8.2
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				$ 9,100,000