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
Jun. 30, 2019
Mar. 31, 2019
Property, Plant and Equipment [Line Items]    
Land $ 672 $ 672
Machinery and equipment 1,378 1,372
Office, computer and research equipment 5,269 5,267
Leasehold improvements 804 798
Land, property and equipment, gross 8,123 8,109
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 6,954 6,811
Land, property and equipment, net $ 1,169 $ 1,298