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, 2014
Mar. 31, 2013
Mar. 31, 2012
Current tax expense:      
Provision for current income taxes related to foreign taxes $ 200,000    
Reconciliation of income tax (benefit) expense to the federal statutory rate      
Federal income tax at the statutory rate (5,452,000) (7,436,000) (6,317,000)
State taxes, net of federal effect (93,000) (661,000) (727,000)
Foreign taxes 134,000 675,000 313,000
R&D tax credit 37,000 (1,157,000) (455,000)
Impact of state rate change 492,000 838,000 (693,000)
Warrant liability (3,000) (299,000) (5,301,000)
Expiring NOL 1,543,000   9,765,000
Valuation allowance 3,614,000 (1,877,000) 3,423,000
Excess tax benefit - stock compensation   10,383,000  
Other (52,000) 228,000 178,000
Income tax expense (benefit) 220,000 694,000 186,000
Deferred tax assets:      
Inventories 2,152,000 1,754,000  
Warranty reserve 1,051,000 866,000  
Deferred revenue 731,000 532,000  
Net operating loss (NOL) carry forwards 214,071,000 211,724,000  
Tax credit carry forwards 18,369,000 18,295,000  
Depreciation, amortization and impairment loss 3,631,000 3,997,000  
Other 5,280,000 5,498,000  
Deferred tax assets 245,285,000 242,666,000  
Valuation allowance for deferred tax assets (236,169,000) (232,555,000)  
Deferred tax assets, net of valuation allowance 9,116,000 10,111,000  
Deferred tax liabilities:      
Federal benefit of state taxes (9,116,000) (10,111,000)  
Valuation allowance      
Change in valuation allowance $ 3,600,000 $ 1,900,000 $ 3,400,000