Subsequent Event - Acquisition-Date Fair Value of Consideration Transferred (Detail) (USD $)	6 Months Ended	1 Months Ended
	Jun. 30, 2013	Jul. 17, 2013 Talon Therapeutics, Inc. [Member] Subsequent Event [Member]
Business Acquisition [Line Items]
Cash consideration	$ 3,000,000	$ 11,300
Contingent value right		6,500
Spectrum shares of common stock		26,300
Total purchase consideration	$ 7,700,000	$ 44,100