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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Mar. 31, 2013 $ 125,118 $ 60 $ 924,390 $ (313) $ 1,112 $ (800,131)
Balance, shares at Mar. 31, 2013   6,030        
Issuance of common stock - ESPP 168   168      
Issuance of common stock - ESPP, shares   10        
Issuance of common stock - restricted shares 502 $ 2 500      
Issuance of common stock - restricted shares, shares   178        
Stock-based compensation expense 10,696   10,696      
Issuance of stock for 401(k) match 425   425      
Issuance of stock for 401(k) match, shares   21        
Issuance of common stock-ATM, net of costs 7,458 $ 5 7,453      
Issuance of common stock-ATM, net of costs, shares   487        
Issuance of common stock to settle liabilities 23,480 $ 12 23,468      
Issuance of common stock to settle liabilities, shares, other   1,167        
Repurchase of treasury stock (57)     (57)    
Cumulative translation adjustment 727       727  
Net loss (56,258)         (56,258)
Balance at Mar. 31, 2014 112,259 $ 79 967,100 (370) 1,839 (856,389)
Balance, shares at Mar. 31, 2014   7,893        
Issuance of common stock - ESPP 124   124      
Issuance of common stock - ESPP, shares   17        
Issuance of common stock - restricted shares   $ 3 (3)      
Issuance of common stock - restricted shares, shares   301        
Stock-based compensation expense 5,936   5,936      
Issuance of stock for 401(k) match 392   392      
Issuance of stock for 401(k) match, shares   35        
Issuance of common stock-ATM, net of costs 5,839 $ 4 5,835      
Issuance of common stock-ATM, net of costs, shares   375        
Issuance of common stock-Hudson Bay Capital 5,225 $ 9 5,216      
Issuance of common stock-Hudson Bay Capital, shares   909        
Issuance of common stock to settle liabilities 1,323 $ 1 1,322      
Issuance of common stock to settle liabilities, shares, other   94        
Reverse stock split (1)   (1)      
Repurchase of treasury stock (401)     (401)    
Cumulative translation adjustment (2,147)       (2,147)  
Net loss (48,656)         (48,656)
Balance at Mar. 31, 2015 79,893 $ 96 985,921 (771) (308) (905,045)
Balance, shares at Mar. 31, 2015   9,624        
Issuance of common stock - ESPP 30   30      
Issuance of common stock - ESPP, shares   8        
Issuance of common stock - restricted shares   $ 4 (4)      
Issuance of common stock - restricted shares, shares   409        
Stock-based compensation expense 3,248   3,248      
Issuance of stock for 401(k) match 377 $ 1 376      
Issuance of stock for 401(k) match, shares   66        
Issuance of common stock-equity offering 22,282 $ 40 22,242      
Issuance of common stock-equity offering, shares   4,000        
Repurchase of treasury stock (110)     (110)    
Cumulative translation adjustment 968       968  
Net loss (23,139)         (23,139)
Balance at Mar. 31, 2016 $ 83,549 $ 141 $ 1,011,813 $ (881) $ 660 $ (928,184)
Balance, shares at Mar. 31, 2016   14,107