Quarterly report pursuant to Section 13 or 15(d)

Land Property and Equipment (Details)

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Land Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Land $ 672 $ 672
Machinery and equipment 1,305 1,296
Office, computer and research equipment 5,288 5,175
Leasehold improvements 798 1,238
Land, property and equipment, gross 8,063 8,381
Less accumulated depreciation and amortization (6,600) (6,780)
Land, property and equipment, net $ 1,463 $ 1,601