Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017		Jun. 01, 2016
Raw materials	$ 616	$ 1,062
Work-in-process	7,321	8,615
Finished goods	4,632	4,771
Total inventories	12,569	14,448
Inventories - current	4,632	6,482	[1]
Inventories - non -current	$ 7,937	$ 7,966	[1]
ICLUSIG
Inventories acquired				$ 4,000

[1] The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date.