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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-in-Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Treasury Stock
Total
Balance at Dec. 31, 2015 $ 32 $ 291,853 $ 51 $ (196,613) $ (132) $ 95,191
Balance (in shares) at Dec. 31, 2015 32,209       (28)  
Stockholders' Deficit            
Common stock issued under stock plans $ 2 8,064       8,066
Common stock issued under stock plans (in shares) 1,756          
Exercise of common stock warrant   112       112
Exercise of common stock warrant (in shares) 6          
Stock-based compensation   8,786       8,786
Other comprehensive income     597     597
Net loss       4,522   4,522
Balance at Dec. 31, 2016 $ 34 308,815 648 (192,091) $ (132) 117,274
Balance (in shares) at Dec. 31, 2016 33,971       (28)  
Stockholders' Deficit            
Common stock issued under stock plans $ 1 4,666       4,667
Common stock issued under stock plans (in shares) 676          
Stock-based compensation   17,592       17,592
Other comprehensive income     (1,239)     (1,239)
Net loss       (92)   (92)
Balance at Dec. 31, 2017 $ 35 331,073 (591) (192,183) $ (132) $ 138,202
Balance (in shares) at Dec. 31, 2017 34,647       (28) 34,619
Stockholders' Deficit            
Common stock issued under stock plans $ 1 21,575       $ 21,576
Common stock issued under stock plans (in shares) 1,488          
Stock-based compensation   25,704       25,704
Other comprehensive income     1,329     1,329
Net loss       (12,951)   (12,951)
Balance at Dec. 31, 2018 $ 36 $ 378,352 $ 738 $ (205,134) $ (132) $ 173,860
Balance (in shares) at Dec. 31, 2018 36,135       (28) 36,107