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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income $ 9,073 $ 6,834 $ 28,453 $ 21,242
Basic:        
Weighted average common shares used in computing basic net income (loss) per share (in shares) 91,222 79,838 85,874 79,045
Add weighted average effect of dilutive securities:        
Stock options and restricted stock (in shares) 2,300 2,922 2,305 3,006
Convertible notes and warrants (in shares) 2,725 0 2,059 0
Contingently issuable shares in connection with our acquisitions (in shares) 343 0 213 0
Weighted average common shares used in computing diluted net income (loss) per share (in shares) 96,590 82,760 90,451 82,051
Net income per share:        
Basic (in dollars per share) $ 0.10 $ 0.09 $ 0.33 $ 0.27
Diluted (in dollars per share) $ 0.09 $ 0.08 $ 0.31 $ 0.26