Out-License of Marqibo, Zevalin, & Evolema in China Territory - Schedule of Proceeds Received and Fair Value on CASI Out-License Execution Date (Parenthetical) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Sep. 17, 2014	Mar. 31, 2015
Other Commitments [Line Items]
Shares received (shares)	5.4
Debt instrument face value	$ 1.5
Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Debt instrument face value	1.5
CASI Out-License [Member]
Other Commitments [Line Items]
Shares received (shares)	5.4
Stock price on the NASDAQ Capital Market	$ 1.60
CASI Out-License [Member] | Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Debt instrument maturity date		Mar. 17, 2016
Debt instrument coupon rate	0.50%
Common Stock [Member] | Other Assets [Member] | CASI Out-License [Member]
Other Commitments [Line Items]
Fair value		7.9