Inventory (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Inventory
Raw materials	$ 289	$ 591
Work-in-process	18,259	18,487
Finished goods	1,897	358
Total inventories	20,445	19,436
Inventories - current	1,897	358	[1]
Inventories - non -current	$ 18,548	$ 19,078	[1]
Shelf life for finished goods inventory, maximum	36 months

[1] The condensed consolidated balance sheet at December 31, 2014 has been derived from the audited financial statements at that date.