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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Gain (Loss)
Treasury Stock
Balance, shares at Dec. 31, 2014   103,663        
Balance, value at Dec. 31, 2014 $ 284,018 $ 104 $ 1,390,619 $ (1,104,252) $ (63) $ (2,390)
Stock-based compensation 1,953 $ 0 1,953 0 0 0
Issuance of common stock under Equity Incentive Plans, shares   167        
Issuance of common stock under Equity Incentive Plans, value 0 $ 0 0 0 0 0
Repurchase of common stock (357) 0 0 0 0 (357)
Net loss (28,076) 0 0 (28,076) 0 0
Unrealized gain on investments 86 0 0 0 86 0
Other (17) $ 0 (17) 0 0 0
Balance, shares at Mar. 31, 2015   103,830        
Balance, value at Mar. 31, 2015 257,607 $ 104 1,392,555 (1,132,328) 23 (2,747)
Balance, shares at Dec. 31, 2015   103,860        
Balance, value at Dec. 31, 2015 285,850 $ 104 1,397,646 (1,108,934) (219) (2,747)
Stock-based compensation 1,835 $ 0 1,835 0 0 0
Issuance of common stock under Equity Incentive Plans, shares   223        
Issuance of common stock under Equity Incentive Plans, value 184 $ 0 184 0 0 0
Repurchase of common stock (621) 0 0 0 0 (621)
Net loss (34,883) 0 0 (34,883) 0 0
Unrealized gain on investments 516 $ 0 0 0 516 0
Balance, shares at Mar. 31, 2016   104,083        
Balance, value at Mar. 31, 2016 $ 252,881 $ 104 $ 1,399,665 $ (1,143,817) $ 297 $ (3,368)