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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands | Total | Common Shares [Member] | Capital in Excess of Par Value [Member] | Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2012 | $ 47,018 | $ 11 | $ 1,617,744 | $ (357) | $ (1,570,380)
Beginning Balance, Shares at Dec. 31, 2012 |  | 115,259 |  |  |
Shares issued under equity compensation plans | 8,208 | $ 0 | 8,208 | 0 | 0
Shares issued under equity compensation plans, Shares |  | 1,235 |  |  |
Stock-based compensation | 17,708 | $ 0 | 17,708 | 0 | 0
Other comprehensive loss | (824) | 0 | 0 | (824) | 0
Net loss | (162,013) | 0 | 0 | 0 | (162,013)
Ending Balance at Dec. 31, 2013 | (89,903) | $ 11 | 1,643,660 | (1,181) | (1,732,393)
Ending Balance, Shares at Dec. 31, 2013 |  | 116,494 |  |  |
Sale of common stock, net of issuance costs of $617 | 116,536 | $ 1 | 116,535 | 0 | 0
Sale of common stock, Shares |  | 9,775 |  |  |
Shares issued under equity compensation plans | 46,984 | $ 1 | 46,983 | 0 | 0
Shares issued under equity compensation plans, Shares |  | 4,947 |  |  |
Stock-based compensation | 17,017 | $ 0 | 17,017 | 0 | 0
Other comprehensive loss | (386) | 0 | 0 | (386) | 0
Net loss | (53,916) | 0 | 0 | 0 | (53,916)
Ending Balance at Dec. 31, 2014 | 36,332 | $ 13 | 1,824,195 | (1,567) | (1,786,309)
Ending Balance, Shares at Dec. 31, 2014 |  | 131,216 |  |  |
Shares issued under equity compensation plans | 32,208 | $ 0 | 32,208 | 0 | 0
Shares issued under equity compensation plans, Shares |  | 4,073 |  |  |
Stock-based compensation | 19,669 | $ 0 | 19,669 | 0 | 0
Other comprehensive loss | (603) | 0 | 0 | (603) | 0
Net loss | (81,177) | 0 | 0 | 0 | (81,177)
Ending Balance at Dec. 31, 2015 | $ 6,429 | $ 13 | $ 1,876,072 | $ (2,170) | $ (1,867,486)
Ending Balance, Shares at Dec. 31, 2015 |  | 135,289 |  |  |

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