Balance Sheet Account Detail Balance Sheet Account Detail - Deferred Revenue (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 17,461	$ 9,959
CASI Out-License [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	9,959	9,959
FUSILEV [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	7,039	0
Dr. Reddy
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 463	$ 0