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 (Parenthetical) (Detail) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended	18 Months Ended
	Sep. 17, 2014	Feb. 29, 2016	Mar. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Shares received (shares)	5.4
Debt instrument face value	$ 1,500,000.00
Fair value			$ 7,520,000	$ 7,520,000	$ 6,689,000
Secured Promissory Note Due March 17, 2016 [Member]
Other Commitments [Line Items]
Debt instrument face value	$ 1,500,000.00
CASI Out-License [Member]
Other Commitments [Line Items]
Shares received (shares)	5.4	1.7		7.1
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] | CASI Out-License [Member]
Other Commitments [Line Items]
Fair value			$ 7,500,000	$ 7,500,000