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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
 [1]
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income
Balance, shares at Dec. 31, 2014   28,776   (10,946)    
Beginning Balance at Dec. 31, 2014 $ 224,504 $ 29 $ 259,007 $ (199,998) $ 165,288 $ 178
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   395   (80)    
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 662 $ 0 662      
Stock-based compensation expense 7,030   7,030      
Foreign currency translation adjustment, net of taxes 18 [2]         18
Net income 3,964 [2],[3]       3,964  
Balance, shares at Dec. 31, 2015   29,171   (11,026)    
Ending Balance at Dec. 31, 2015 236,178 $ 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   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) $ 0 (1,187)      
Stock-based compensation expense 7,266   7,266      
Foreign currency translation adjustment, net of taxes (23) [2]         (23)
Net income 304 [2],[3]       304  
Balance, shares at Dec. 31, 2016   29,492   (11,136)    
Ending Balance at Dec. 31, 2016 252,280 [4] $ 29 272,778 $ (199,998) 179,298 173
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member] 9,742       9,742  
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   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 (766)      
Stock-based compensation expense 9,694   9,694      
Foreign currency translation adjustment, net of taxes 29 [2]         29
Net income 25,426 [2],[3]       25,426  
Balance, shares at Dec. 31, 2017   29,880   (11,238)    
Ending Balance at Dec. 31, 2017 $ 286,664 [4] $ 30 $ 281,706 $ (199,998) $ 204,724 $ 202
[1] As 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