Inventory (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016		Jun. 01, 2016
Raw materials	$ 109	$ 109
Work-in-process	11,188	15,084
Finished goods	3,261	4,106
Total inventories	14,558	19,299
Inventories - current	3,261	4,106	[1]
Inventories - non -current	$ 11,297	$ 15,193	[1]
JAKAFI
Shelf life for finished goods inventory, maximum	36 months
ICLUSIG
Inventories acquired				$ 4,000
Shelf life for finished goods inventory, maximum	24 months

[1] The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited financial statements at that date.