Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Current tax expense:      
Provision for current income taxes related to foreign taxes $ 700,000    
Reconciliation of income tax (benefit) expense to the federal statutory rate      
Federal income tax at the statutory rate (7,436,000) (6,317,000) (12,997,000)
State taxes, net of federal effect (661,000) (727,000) (1,390,000)
Foreign taxes 675,000 313,000 461,000
R&D tax credit (1,157,000) (455,000) (367,000)
Impact of state rate change 838,000 (693,000) 1,541,000
Warrant liability (299,000) (5,301,000) 9,981,000
Expiring NOL   9,765,000 6,278,000
Valuation allowance (1,877,000) 3,423,000 (4,343,000)
Excess tax benefit - stock compensation 10,383,000    
Other 228,000 178,000 1,076,000
Income tax expense (benefit) 694,000 186,000 240,000
Deferred tax assets:      
Inventories 1,754,000 1,492,000  
Warranty reserve 866,000 597,000  
Deferred revenue 532,000 466,000  
Net operating loss (NOL) carry forwards 211,724,000 215,545,000  
Tax credit carry forwards 18,295,000 17,013,000  
Depreciation, amortization and impairment loss 3,997,000 4,252,000  
Other 5,498,000 5,434,000  
Deferred tax assets 242,666,000 244,799,000  
Valuation allowance for deferred tax assets (232,555,000) (234,432,000)  
Deferred tax assets, net of valuation allowance 10,111,000 10,367,000  
Deferred tax liabilities:      
Federal benefit of state taxes (10,111,000) (10,367,000)  
Net deferred tax assets 0    
Valuation allowance      
Change in valuation allowance $ 1,900,000 $ 3,400,000 $ 4,300,000