Out-License of MARQIBO, ZEVALIN, & EVOMELA in China Territory - Schedule of Proceeds Received and Fair Value on CASI Out-License Execution Date (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	Sep. 17, 2014	Dec. 31, 2017	Dec. 31, 2016
Secured Promissory Note [Member]
Other Commitments [Line Items]
Debt instrument face value	$ 1,500
CASI Out License [Member]
Other Commitments [Line Items]
Total consideration received	$ 9,959
Shares received (shares)	5.4	1.5	4.6
Stock price on the NASDAQ Capital Market ($ per share)	$ 1.6
CASI Out License [Member] | Secured Promissory Note [Member]
Other Commitments [Line Items]
Total consideration received	$ 1,310
Debt instrument coupon rate	0.50%
CASI Out License [Member] | Common Stock [Member]
Other Commitments [Line Items]
Total consideration received	$ 8,649