Net Income Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The computations for basic and diluted net income per share are as follows:

	Year Ended December 31,
	2016		2015		2014
	(in thousands, except per share data)
Numerator:
Net income - basic and diluted	$	19,224	$	15,865	$	30,244
Denominator:
Weighted-average shares used in computing net income per share - basic	35,247		34,050		32,979
Effect of potentially dilutive securities:
Common stock options	3,052		4,134		4,191
RSUs	70		—		—
Weighted-average shares used in computing net income per share - diluted	38,369		38,184		37,170
Net income per share:
Basic	$	0.55	$	0.47	$	0.92
Diluted	$	0.50	$	0.42	$	0.81

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Potentially dilutive securities not included in the calculation of diluted net income per share because doing so would be antidilutive are as follows:

	Year Ended December 31,
	2016	2015	2014
	(in thousands)
Common stock options	3,241	1,582	1,689
RSUs	24	—	—