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Inventory (Schedule of Inventory) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Inventory Disclosure [Abstract]      
Raw materials $ 528   $ 863
Work in process 3,919   2,343
Finished goods 1,121   738
Total 5,568   3,944
Less: non-current portion included in Other assets (143)   (606)
Inventory, net 5,425   $ 3,338 [1]
Inventory write-down $ 500 $ 0  
[1] The condensed consolidated balance sheet as of December 31, 2016 has been derived from the audited financial statements as of that date.