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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]        
Net income (loss) $ 935,000 $ (21,827,000) $ (17,860,000) $ (35,571,000)
Other Comprehensive income (loss), net of tax:        
Unrealized gain (loss) on short-term investments 4,000 9,000 6,000 (17,000)
Foreign currency translation 104,000 (389,000) (250,000) (835,000)
Total other comprehensive income (loss), net of tax 108,000 (380,000) (244,000) (852,000)
Comprehensive income (loss) $ 1,043,000 $ (22,207,000) $ (18,104,000) $ (36,423,000)