Out-License of Marqibo, Zevalin, and Evolema in China Territory - Additional Information (Detail) $ in Thousands, shares in Millions		3 Months Ended	12 Months Ended
	Sep. 17, 2014 USD ($) product agreement shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Other Commitments [Line Items]
Fair value		$ 14,241	$ 11,533
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) | shares	5.4	10.0	4.6
Undiscounted proceeds	$ 9,700
Common Stock [Member] | CASI Out-License [Member]
Other Commitments [Line Items]
Fair value		$ 14,200