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Balance Sheet Detail - Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories:      
Work-in-process $ 1,071 $ 1,270 $ 1,478
Finished goods 175 181 119
Total $ 1,246 $ 1,451 $ 1,597