Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 31, 2018
Components of inventories    
Raw materials $ 3,440 $ 2,969
Finished goods 6,723 6,253
Total inventories $ 10,163 $ 9,222