Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details)

v3.4.0.3
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands, shares in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2013
Inventories        
Increase in inventory charges $ 1,000      
Revenue        
Term for advance payment from shipment of sales 90 days      
Research and Development ("R&D")        
Total offsets to R&D expenses $ 200 $ 500 $ 1,400  
Risk Concentrations        
Aggregate balances that exceed insurance coverage 16,500      
Allowance for Doubtful Accounts Receivable, Recoveries 1,500      
Provision for Doubtful Accounts $ (1,459) $ 10,138 $ 242  
Net Loss Per Common Share        
Options outstanding (in shares) 0.5 0.7 0.7  
Outstanding restricted stock units (in shares) 0.3 0.1 0.1  
Revenue | Customer concentrations | Horizon        
Risk Concentrations        
Concentration percentage 15.00% 17.00% 12.00%  
Revenue | Customer concentrations | E-Finity        
Risk Concentrations        
Concentration percentage 11.00%   19.00%  
Revenue | Customer concentrations | DTC        
Risk Concentrations        
Concentration percentage 10.00%      
Revenue | Customer concentrations | Optimal        
Risk Concentrations        
Concentration percentage 10.00%      
Revenue | Customer concentrations | BPC        
Risk Concentrations        
Concentration percentage 2.00% 11.00% 17.00%  
Allowance for Doubtful Accounts Receivable   $ 7,100    
Net accounts receivable | Credit concentration | DTC        
Risk Concentrations        
Concentration percentage 28.00%      
Net accounts receivable | Credit concentration | Optimal        
Risk Concentrations        
Concentration percentage 11.00% 17.00%    
Net accounts receivable | Credit concentration | BPC        
Risk Concentrations        
Allowance for Doubtful Accounts Receivable       $ 2,600
Net accounts receivable | Credit concentration | RSP Systems        
Risk Concentrations        
Concentration percentage 10.00%      
Net accounts receivable | Credit concentration | Regale        
Risk Concentrations        
Concentration percentage 10.00%      
Backlog        
Depreciation and Amortization        
Finite-lived intangible asset amount written off $ 100      
TA100        
Inventories        
Inventory allowance $ 800      
Minimum        
Depreciation and Amortization        
Estimated Useful Life 2 years      
Maximum        
Depreciation and Amortization        
Estimated Useful Life 10 years      
Warranty        
Warranty period 24 months