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Consolidated Statements of Stockholders' Equity - 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, 2014 $ 36,332 $ 13 $ 1,824,195 $ (1,567) $ (1,786,309)
Beginning 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      
Sale of common stock, net of issuance costs 189,276 $ 2 189,274 0 0
Sale of common stock, Shares   14,950      
Shares issued under equity compensation plans 20,287 $ 0 20,287 0 0
Shares issued under equity compensation plans, Shares   2,973      
Stock-based compensation 25,850 $ 0 25,850 0 0
Other comprehensive loss (193) 0 0 (193) 0
Net loss (153,524) 0 0 0 (153,524)
Ending Balance at Dec. 31, 2016 88,125 $ 15 2,111,483 (2,363) (2,021,010)
Ending Balance, Shares at Dec. 31, 2016   153,212      
Shares issued under equity compensation plans 59,528 $ 0 59,528 0 0
Shares issued under equity compensation plans, Shares   6,312      
Stock-based compensation 36,615 $ 0 36,615 0 0
Other comprehensive loss 252 0 239 252 (239)
Net loss (96,692) 0 0 0 (96,692)
Ending Balance at Dec. 31, 2017 $ 87,828 $ 15 $ 2,207,865 $ (2,111) $ (2,117,941)
Ending Balance, Shares at Dec. 31, 2017   159,524