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CONSOLIDATED STATEMENT OF STOCKHOLDER'S EQUITY (DEFICIT) (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Accumulated deficit
Treasury stock
Balance at beginning of period at Dec. 31, 2010 $ (4,849) $ 21 $ 729,271 $ 31 $ (691,947) $ (42,225)
Balance at beginning of period (in shares) at Dec. 31, 2010   20,620,917       1,111,999
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock compensation plans, net 54    54         
Issuance of common stock under employee stock compensation plans (in shares)   61,589         
Unrealized net loss on available-for-sale securities (31)       (31)      
Repurchase of common stock (55)             (55)
Repurchase of common stock (in shares)            (6,223)
Stock-based compensation 3,351    3,351         
Shares released from restriction 0          
Net income (loss) 9,715    0    9,715   
Balance at end of period at Dec. 31, 2011 8,185 21 732,676    (682,232) (42,280)
Balance at end of period (in shares) at Dec. 31, 2011   20,682,506       1,118,222
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock compensation plans, net 1,103    1,103         
Issuance of common stock under employee stock compensation plans (in shares)   180,979         
Issuance of common stock, net 5,313    5,313         
Issuance of common stock, net (in shares)   302,750         
Stock-based compensation 4,067    4,067         
Shares released from restriction 8,344    8,344         
Shares released from restriction (in shares)   112,371         
Net income (loss) (527)          (527)   
Balance at end of period at Dec. 31, 2012 26,485 21 751,503    (682,759) (42,280)
Balance at end of period (in shares) at Dec. 31, 2012   21,278,606       1,118,222
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under employee stock compensation plans, net 3,128 1 3,127         
Issuance of common stock under employee stock compensation plans (in shares)   308,137         
Unrealized net loss on available-for-sale securities 2,914       2,914      
Stock-based compensation 5,666    5,666         
Retirement of treasury shares (in shares) (1,118,222) (1,118,222)       (1,118,222)
Retirement of treasury shares 0 (1) (42,279) 0 0 42,280
Shares released from restriction 0          
Net income (loss) 11,420          11,420   
Balance at end of period at Dec. 31, 2013 $ 49,613 $ 21 $ 718,017 $ 2,914 $ (671,339)   
Balance at end of period (in shares) at Dec. 31, 2013   20,468,521