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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income
Balance, shares (in shares) at Dec. 31, 2015   29,171   11,026    
Beginning Balance at Dec. 31, 2015 $ 236,178 [1] $ 29 $ 266,699 $ (199,998) $ 169,252 $ 196
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares (in shares)   (321)   (110)    
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards (1,187) [1] $ 0 (1,187)      
Stock-based compensation expense 7,266 [1]   7,266      
Foreign currency translation adjustment, net of taxes (23) [1],[2]         (23)
Net income (loss) 304 [1],[2],[3]       304  
Balance, shares (in shares) at Dec. 31, 2016   29,492   11,136    
Ending Balance at Dec. 31, 2016 252,280 [1] $ 29 272,778 $ (199,998) 179,298 173
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares (in shares)   (388)   (102)    
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards (765) [1] $ 1 (766)      
Stock-based compensation expense 9,694 [1]   9,694      
Foreign currency translation adjustment, net of taxes 29 [1],[2]         29
Net income (loss) 25,426 [1],[2],[3],[4]       25,426  
Balance, shares (in shares) at Dec. 31, 2017   29,880   11,238    
Ending Balance at Dec. 31, 2017 286,664 [1],[5] $ 30 281,706 $ (199,998) 204,724 202
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares (in shares)   (688)        
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards (1,816) [1] $ 1 (1,817)      
Stock-based compensation expense 12,540 [1]   12,540      
Foreign currency translation adjustment, net of taxes [1] (75)          
Net income (loss) 241 [1]       241  
Common stock traded for employee tax obligation (in shares)       (188)    
Stock issued for GMG acquisition (in shares)   295        
Stock issued for GMG acquisition 5,595 [1]   5,595      
Balance, shares (in shares) at Dec. 31, 2018   30,863   11,426    
Ending Balance at Dec. 31, 2018 $ 303,149 [1] $ 31 $ 298,024 $ (199,998) $ 204,965 $ 127
[1] Balances and the years ended December 31, 2016 and 2017 have been adjusted for the adoption of ASC 606 using the full retrospective method.
[2] As adjusted for the adoption of ASC 606 using the full retrospective method.
[3] As adjusted for the adoption of ASC 606 using the full retrospective method.
[4] As adjusted for the adoption of ASC 606 using the full retrospective method
[5] As adjusted for the adoption of ASC 606 using the full retrospective method.