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Stock-Based Compensation Unvested Stock Option Awards (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Remaining Contractual Term, (in years) 3 years 8 months 5 days
Unvested Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested (in shares) 2,260
Granted (in shares) 3,350
Forfeited (in shares) (70)
Vested (in shares) (649)
Unvested (in shares) 4,891
Unvested, Weighted Average Grant Date Fair Value (usd per share) 1.95
Granted, Weighted Average Exercise Price (usd per share) 1.57
Forfeited, Weighted Average Exercise Price (usd per share) 1.79
Vested, Weighted Average Exercise Price (usd per share) 1.89
Unvested, Weighted Average Grant Date Fair Value (usd per share) 1.70
Unvested, Aggregate Grant Date Fair Value 4,416
Granted, Aggregate Grant Date Fair Value 5,243
Forfeited, Aggregate Grant Date Fair Value (125)
Vested, Aggregate Grant Date Fair Value (1,229)
Unvested, Aggregate Grant Date Fair Value 8,305
Unearned compensation 4,622