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, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]    
Land $ 672 $ 672
Machinery and equipment 1,296 1,698
Office, computer and research equipment 5,175 6,012
Leasehold improvements 1,238 7,680
Land, property and equipment, gross 8,381 16,062
Less accumulated depreciation and amortization (6,780) (14,078)
Land, property and equipment, net $ 1,601 $ 1,984