Quarterly report pursuant to Section 13 or 15(d)

Inventories - Current (Details)

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Inventories - Current (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Inventories    
Raw materials $ 19,716 $ 17,981
Work in process 30 111
Finished goods 1,449 4,076
Total 21,195 22,168
Less inventory reserve (4,609) (5,494)
Less non-current portion (1,109) (1,041)
Current portion $ 15,477 $ 15,633
Weighted average age of noncurrent inventories 1 year 3 months 18 days