Net Product Sales by Geographic Region and Product Line, and Composition of License Fees and Service Revenue - By Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Concentration Risk [Line Items]
License fees and service revenue	$ 3,121	$ 170	$ 14,807	$ 10,212
License fees and service revenues	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	100.00%	100.00%	100.00%	100.00%
Out-license to Servier in Canada territory [Member]
Concentration Risk [Line Items]
License fees and service revenue	$ 0	$ 0	$ 6,000	$ 0
Out-license to Servier in Canada territory [Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	0.00%	0.00%	40.50%	0.00%
Co-Promotion With Eagle [Member]
Concentration Risk [Line Items]
License fees and service revenue		$ 0	$ 6,737	$ 0
Co-Promotion With Eagle [Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	77.10%	0.00%	45.50%	0.00%
Out-license to Mundipharma in China and other ex-U.S. territories[Member]
Concentration Risk [Line Items]
License fees and service revenue	$ 703	$ 158	$ 2,013	$ 493
Out-license to Mundipharma in China and other ex-U.S. territories[Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	22.50%	92.90%	13.60%	4.80%
CASI Out-License [Member]
Concentration Risk [Line Items]
License fees and service revenue	$ 0	$ 0	$ 0	$ 9,682
CASI Out-License [Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	0.00%	0.00%	0.00%	94.80%
Other license fees and service revenue [Member]
Concentration Risk [Line Items]
License fees and service revenue	$ 12	$ 12	$ 57	$ 37
Other license fees and service revenue [Member] | Sales Revenue, Services, Net [Member]
Concentration Risk [Line Items]
License fees and service revenues	0.40%	7.10%	0.40%	0.40%