Out-License of Marqibo, Zevalin, and Evolema in China Territory to CASI - Additional Information (Detail) shares in Millions		1 Months Ended	3 Months Ended	18 Months Ended
	Sep. 17, 2014 product agreement shares	Feb. 29, 2016 shares	Mar. 31, 2016	Mar. 31, 2016 shares
Other Commitments [Line Items]
Shares received (shares)	5.4
CASI Out-License [Member]
Other Commitments [Line Items]
Number of agreements | agreement	3
Number of products | product	2
License agreement description			Additionally, under certain conditions which generally expire on September 17, 2019, we have a right to receive additional CASI common stock in order to maintain our post-investment ownership percentage if CASI issues additional securities.
Shares received (shares)	5.4	1.7		7.1