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Consolidated Statements Of Convertible Preferred Stock And Stockholders' Equity (Deficit) (USD $)
In Thousands, unless otherwise specified
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2008 $ 426,403 $ 100 $ 43,497   $ (365,994) $ (322,397)
Balance, Shares at Dec. 31, 2008 15,908 4,024        
Stock-based compensation     9,196     9,196
Exercise of stock options   2 46     48
Exercise of stock options, shares   63        
Preferred stock dividend 3,747       (3,747) (3,747)
Preferred stock dividend, shares 272          
Issuance of Series J preferred stock, net of issuance costs 49,478          
Issuance of series J preferred stock, net of issuance costs, shares 6,312          
Comprehensive loss:            
Net loss         (22,441) (22,441)
Unrealized gain (loss) on short-term investments       (17)   (17)
Total comprehensive loss           (22,458)
Balance at Dec. 31, 2009 479,628 102 52,739 (17) (392,182) (339,358)
Balance, Shares at Dec. 31, 2009 22,492 4,087        
Stock-based compensation     25,575     25,575
Exercise of stock options   4 284     288
Exercise of stock options, shares   164        
Preferred stock dividend 900       (900) (900)
Preferred stock dividend, shares 54          
Preferred Stock and Preferred Stock Warrant Conversion Upon Completion of The IPO 480,528 (703) (480,192)     (480,895)
Preferred stock and preferred stock warrant conversion upon completion of the IPO,shares (22,546) (28,115)        
IPO proceeds, net of issuance costs and underwriters' discount   128 57,184     57,312
IPO proceeds, net of issuance costs and underwriters' discount, shares   5,116        
RSU vesting, net of taxes withheld   31 (10,035)     (10,004)
RSU vesting, net of taxes withheld, shares   1,230        
Comprehensive loss:            
Net loss         (18,553) (18,553)
Unrealized gain (loss) on short-term investments       38   38
Translation adjustment       10   10
Total comprehensive loss           (18,505)
Balance at Dec. 31, 2010   968 605,939 31 (411,635) 195,303
Balance, Shares at Dec. 31, 2010   38,712        
Stock-based compensation     21,603     21,603
Acquisition of Occam Networks   159 118,469     118,628
Acquisition of Occam Networks, shares   6,359        
Exercise of stock options and warrants   5 799     804
Exercise of stock options and warrants, shares   207        
RSU vesting, net of taxes withheld   42 (10,418)     (10,376)
RSU vesting, net of taxes withheld, shares   1,703        
Restricted stock awards issued   11 (11)      
Restricted stock awards issued, shares   423        
Stock issued under employee stock purchase plan   10 3,928     3,938
Stock issued under employee stock purchase plan, shares   421        
Comprehensive loss:            
Net loss         (52,550) (52,550)
Unrealized gain (loss) on short-term investments       (21)   (21)
Translation adjustment       88   88
Total comprehensive loss           (52,483)
Balance at Dec. 31, 2011   $ 1,195 $ 740,309 $ 98 $ (464,185) $ 277,417
Balance, Shares at Dec. 31, 2011   47,825