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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 |  |  |  |

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