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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Total
Balance at Mar. 31, 2010 $ 448 $ 698,417   $ (7,011) $ (410,889) $ 280,965
Balance, shares at Mar. 31, 2010 44,846,000          
Exercise of stock options 6 7,198       7,204
Exercise of stock options, shares 567,000          
Issuance of common stock - ESPP   614       614
Issuance of common stock - ESPP, shares 26,000          
Issuance of common stock - restricted shares 3 (3)        
Issuance of common stock - restricted shares, shares 301,000          
Stock-based compensation expense   13,412       13,412
Non-employee stock-based compensation expense   31       31
Issuance of stock for calendar 401(k) match   841       841
Issuance of stock for calendar 401(k) match, shares 29,000          
Issuance of common stock- follow-on public offering, net of costs 46 155,194       155,240
Issuance of common stock- follow-on public offering, net of costs, shares 4,600,000          
Contingent consideration 4 10,000       10,004
Contingent consideration shares 350,000          
Net unrealized losses on investments       (90)   (90)
Cumulative translation adjustment       10,918   10,918
Net loss         (186,284) (186,284)
Balance at Mar. 31, 2011 507 885,704   3,817 (597,173) 292,855
Balance, shares at Mar. 31, 2011 50,719,000          
Exercise of stock options   24       24
Exercise of stock options, shares 3,000          
Issuance of common stock - ESPP 1 303       304
Issuance of common stock - ESPP, shares 89,000          
Issuance of common stock - restricted shares 7 (7)        
Issuance of common stock - restricted shares, shares 698,000          
Stock-based compensation expense   9,864       9,864
Issuance of stock for calendar 401(k) match 1 719       720
Issuance of stock for calendar 401(k) match, shares 127,000          
Contingent consideration 4 (4)        
Contingent consideration shares 350,000          
Treasury stock, at cost     271     271
Cumulative translation adjustment       (1,790)   (1,790)
Net loss         (136,827) (136,827)
Balance at Mar. 31, 2012 520 896,603 (271) 2,027 (734,000) 164,879
Balance, shares at Mar. 31, 2012 51,986,000         51,962,141
Exercise of stock options   2       2
Exercise of stock options, shares           480
Issuance of common stock - ESPP 1 289       290
Issuance of common stock - ESPP, shares 100,000          
Issuance of common stock - restricted shares 25 1,594       1,619
Issuance of common stock - restricted shares, shares 2,463,000          
Stock-based compensation expense   8,138       8,138
Issuance of stock for calendar 401(k) match 2 537       539
Issuance of stock for calendar 401(k) match, shares 158,000          
Issuance of common stock to settle liabilities 55 16,684       16,739
Issuance of common stock to settle liabilities, shares 5,593,000          
Treasury stock, at cost     42     42
Net unrealized losses on investments       (28)   (28)
Cumulative translation adjustment       (887)   (887)
Net loss         (66,131) (66,131)
Balance at Mar. 31, 2013 $ 603 $ 923,847 $ (313) $ 1,112 $ (800,131) $ 125,118
Balance, shares at Mar. 31, 2013 60,300,000         60,300,466