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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 692 $ 863
Work in process 2,462 2,343
Finished goods 774 738
Total 3,928 3,944
Less: non-current portion included in Other assets (624) (606)
Inventory 3,304 $ 3,338 [1]
Inventory write-down $ 500  
[1] The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited financial statements as of that date.