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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Preferred Stock [Member] | Common Stock [Member] | Paid-In Capital [Member] | Accumulated Comprehensive Income [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 1 | $ 214 | $ 876,686 | $ 0 | $ (853,310) | $ 23,591
Balance (in shares) at Dec. 31, 2010 | 3,000 | 28,491,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 0 | 2 | 1,099 | 0 | 0 | 1,101
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 253,000 |  |  |  |
Stock-based compensation expense | 0 | 0 | 7,759 | 0 | 0 | 7,759
Sale of shares of common stock | 0 | 45 | 15,043 | 0 | 0 | 15,088
Sale of shares of common stock (in shares) |  | 6,108,000 |  |  |  |
Issuance of warrants | 0 | 0 | 215 | 0 | 0 | 215
Conversion of Series B convertible preferred stock | (1) | 2 | (1) | 0 | 0 | 0
Conversion of Series B convertible preferred stock (in shares) | (3,000) | 255,000 |  |  |  |
Comprehensive loss: |  |  |  |  |  |
Net loss | 0 | 0 | 0 | 0 | (32,743) | (32,743)
Balance at Dec. 31, 2011 | 0 | 263 | 900,801 | 0 | (886,053) | 15,011
Balance (in shares) at Dec. 31, 2011 | 0 | 35,107,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 0 | 8 | 1,323 | 0 | 0 | 1,331
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 1,089,000 |  |  |  |
Release of restricted stock units | 0 | 0 | 0 | 0 | 0 | 0
Release of restricted stock units (in shares) |  | 397,000 |  |  |  |
Stock-based compensation expense | 0 | 0 | 4,284 | 0 | 0 | 4,284
Sale of shares of common stock | 0 | 340 | 75,960 | 0 | 0 | 76,300
Sale of shares of common stock (in shares) |  | 45,288,000 |  |  |  |
Issuance of warrants |  | 0 | (6,335) | 0 | 0 | (6,335)
Exercise of warrants |  | 4 | 1,929 | 0 | 0 | 1,933
Exercise of warrants (in shares) |  | 566,000 |  |  |  |
Comprehensive loss: |  |  |  |  |  |
Net loss |  | 0 | 0 | 0 | (71,065) | (71,065)
Comprehensive loss |  | 0 | 0 | 8 | 0 | 8
Balance at Dec. 31, 2012 | 0 | 615 | 977,962 | 8 | (957,118) | 21,467
Balance (in shares) at Dec. 31, 2012 | 0 | 82,447,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, contributions to 401(k) and incentive plans | 0 | 7 | 2,213 | 0 | 0 | 2,220
Exercise of stock options, contributions to 401(k) and incentive plans (in shares) |  | 933,000 |  |  |  |
Release of restricted stock units | 0 | 6 | (6) | 0 | 0 | 0
Release of restricted stock units (in shares) |  | 801,000 |  |  |  |
Stock-based compensation expense | 0 | 0 | 5,099 | 0 | 0 | 5,099
Sale of shares of common stock | 0 | 147 | 82,799 | 0 | 0 | 82,946
Sale of shares of common stock (in shares) |  | 19,661,000 |  |  |  |
Exercise of warrants | 0 | 12 | 8,336 | 0 | 0 | 8,348
Exercise of warrants (in shares) |  | 1,544,000 |  |  |  |
Comprehensive loss: |  |  |  |  |  |
Net loss | 0 | 0 | 0 | 0 | (124,058) | (124,058)
Comprehensive loss | 0 | 0 | 0 | (9) | 0 | (9)
Balance at Dec. 31, 2013 | $ 0 | $ 787 | $ 1,076,403 | $ (1) | $ (1,081,176) | $ (3,987)
Balance (in shares) at Dec. 31, 2013 | 0 | 105,386,000 |  |  |  |

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