Quarterly report pursuant to Section 13 or 15(d)

Net Income per Share - Calculation of Basic and Diluted Net Income Per Share (Details)

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Net Income per Share - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 6,834 $ 4,210 $ 21,242 $ 9,289
Basic:        
Weighted average common shares used in computing basic net income (loss) per share (in shares) 79,838 76,823 79,045 76,615
Add weighted average effect of dilutive securities:        
Stock options and restricted stock (in shares) 2,922 1,301 3,006 910
Weighted average common shares used in computing diluted net income (loss) per share (in shares) 82,760 78,124 82,051 77,525
Net income per share:        
Basic (in dollars per share) $ 0.09 $ 0.05 $ 0.27 $ 0.12
Diluted (in dollars per share) $ 0.08 $ 0.05 $ 0.26 $ 0.12