Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details Textual)

v3.4.0.3
Acquisitions Acquisitions (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 02, 2014
Apr. 02, 2013
Business Acquisition [Line Items]          
Revenue $ 88,203 $ 84,127 $ 102,073    
Operating Income (Loss) $ (16,756) (59,240) (3,433)    
CSI [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired       100.00%  
Payments to Acquire Businesses, Gross     39,000    
Working Capital Adjustment       $ 5,000  
Business Combination, Acquisition Related Costs   $ 39 200    
Revenue     3,700    
Operating Income (Loss)     (400)    
Kentrox [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired         100.00%
Payments to Acquire Businesses, Gross     $ 30,000    
Working Capital Adjustment         $ 1,300