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Inventory (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 1,037 $ 1,118
Work in process 2,251 2,845
Finished goods 583 559
Total 3,871 4,522
Less: non-current portion included in Other long-term assets (1,255) (2,141)
Inventory 2,616 2,381
Inventory write-down $ 1,200 $ 200