Quarterly report pursuant to Section 13 or 15(d)

Property, Plant, Equipment and Rental Assets (Details)

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Property, Plant, Equipment and Rental Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 31,772   $ 31,772   $ 29,334
Less, accumulated depreciation (26,622)   (26,622)   (26,475)
Total property, plant, equipment and rental assets, net 5,150   5,150   2,859
Value of C1000 Signature systems deployed under factory rental program 2,600        
Depreciation expense 300 $ 200 800 $ 600  
Machinery, equipment, automobiles and furniture          
Property, Plant and Equipment          
Total property, plant and equipment, gross 15,274   15,274   15,302
Leasehold improvements          
Property, Plant and Equipment          
Total property, plant and equipment, gross 11,074   11,074   10,949
Molds and tooling          
Property, Plant and Equipment          
Total property, plant and equipment, gross 2,834   2,834   2,904
Rental assets          
Property, Plant and Equipment          
Total property, plant and equipment, gross $ 2,590   $ 2,590   $ 179