Selected Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure (Unaudited) [Abstract]

Selected Quarterly Financial Information (Unaudited)

Summarized quarterly financial information for the years ended December 31, 2014 and 2013 is as follows (in thousands):

	Three Months Ended
	March 31, 2014		June 30, 2014			September 30, 2014			December 31, 2014
Revenue	$	61,888	$	64,293		$	65,407		$	67,747
Cost of revenue	28,920		31,542			30,444			33,529
Selling, general and administrative expenses	17,255		18,579			17,786			18,059
Loss on sale of patent assets	—		(699		)	(8		)	—
Operating income	15,713		14,871			17,185			16,159
Other income, net	99		94			73			88
Income before provision for income taxes	15,812		14,965			17,258			16,247
Provision for income taxes	5,952		5,566			6,425			6,998
Net income	$	9,860	$	9,399		$	10,833		$	9,249
Net income available to common stockholders:
Basic	$	9,860	$	9,399		$	10,833		$	9,249
Diluted	$	9,860	$	9,399		$	10,833		$	9,249
Net income available to common stockholders per common share(1):
Basic	$	0.19	$	0.18		$	0.20		$	0.17
Diluted	$	0.18	$	0.17		$	0.20		$	0.17
Other Data:
Deferred revenue, including current portion	$	140,534	$	131,207		$	112,820		$	136,209
Stock-based compensation expense	$	3,803	$	5,065		$	4,486		$	4,302

	Three Months Ended
	March 31, 2013		June 30, 2013		September 30, 2013		December 31, 2013
Revenue	$	61,194	$	57,481	$	58,554	$	60,275
Cost of revenue	23,670		24,694		29,766		32,641
Selling, general and administrative expenses	14,473		15,736		15,584		16,732
(Gain) on sale of patent assets	—		126		—		—
Operating income	23,051		16,925		13,204		10,902
Other income (expense), net	51		63		56		43
Income before provision for income taxes	23,102		16,988		13,260		10,945
Provision for income taxes	8,407		6,291		4,863		3,951
Net income	$	14,695	$	10,697	$	8,397	$	6,994
Net income available to common stockholders:
Basic	$	14,678	$	10,691	$	8,395	$	6,994
Diluted	$	14,678	$	10,691	$	8,395	$	6,994
Net income available to common stockholders per common share(1):
Basic	$	0.29	$	0.21	$	0.16	$	0.13
Diluted	$	0.28	$	0.20	$	0.16	$	0.13
Other Data:
Deferred revenue, including current portion	$	118,177	$	117,573	$	105,230	$	137,743
Stock-based compensation expense	$	3,708	$	4,478	$	3,895	$	4,033

⁽¹⁾ Basic and diluted earnings per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted earnings per share.