Annual report pursuant to Section 13 and 15(d)

Restructuring Charge (Details Textual)

v3.4.0.3
Restructuring Charge (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
employees
Mar. 31, 2014
USD ($)
employees
Mar. 31, 2013
USD ($)
Restructuring Charge (Textual) [Abstract]                        
Restructuring $ 731,000 $ 0 $ 0 $ 17,000 $ 3,188,000 $ 0 $ (2,000) $ 57,000 $ 748,000 $ 3,243,000 $ 335,000  
Accrued restructuring 1,537,000       1,161,000       1,537,000 1,161,000    
Accrued restructuring non-current 550,000       1,642,000       550,000 1,642,000    
Payments for Restructuring                 1,479,000 425,000 284,000  
Unpaid balance of restructuring charges 2,087,000       2,803,000       2,087,000 $ 2,803,000 $ 57,000 $ 6,000
4Q16 Restructuring [Member]                        
Restructuring Charge (Textual) [Abstract]                        
Restructuring 700,000                      
4Q15 Restructuring [Member]                        
Restructuring Charge (Textual) [Abstract]                        
Restructuring and Related Cost, Number of Positions Eliminated | employees                   17    
Restructuring         3,200,000              
Impairment of Leasehold         2,700,000              
Kentrox [Member]                        
Restructuring Charge (Textual) [Abstract]                        
Restructuring and Related Cost, Number of Positions Eliminated | employees                     12  
Restructuring                   $ 55,000 $ 335,000  
Payments for Restructuring                     278,000  
Cumulative Restructuring                 390,000      
Employee Related Restructuring Cost [Member]                        
Restructuring Charge (Textual) [Abstract]                        
Restructuring                 674,000 337,000 335,000  
Accrued restructuring                     57,000  
Payments for Restructuring                 263,000 379,000 284,000  
Unpaid balance of restructuring charges 441,000       15,000       441,000 15,000 57,000 6,000
Other Restructuring Costs [Member]                        
Restructuring Charge (Textual) [Abstract]                        
Restructuring                 74,000 2,906,000    
Payments for Restructuring                 1,216,000 46,000    
Unpaid balance of restructuring charges $ 1,646,000       $ 2,788,000       $ 1,646,000 $ 2,788,000 $ 0 $ 0