Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 2)

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Land $ 672 $ 672
Machinery and equipment 1,372 1,296
Office, computer and research equipment 5,267 5,175
Leasehold improvements 798 1,238
Land, property and equipment, gross 8,109 8,381
Less accumulated depreciation and amortization (6,811) (6,780)
Land, property and equipment, net $ 1,298 $ 1,601