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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory [Abstract]      
Raw materials $ 220 $ 326 $ 153
Work in process 7 238 64
Finished goods 555 497 538
Total Inventory $ 782 $ 1,061 $ 755