Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Selected quarterly financial information for 2019 and 2018 is as follows:


	Quarter Ended
	Dec. 31, 2019		Sept. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sept. 30, 2018		Jun. 30, 2018		Mar. 31, 2018

	(unaudited, in thousands, except per share data)
Revenue	$	92,263	$	83,769	$	77,436	$	74,538	$	72,335	$	65,304	$	61,120	$	58,905
Cost of revenue ⁽¹⁾⁽²⁾	37,940		34,472		31,248		30,851		28,339		26,179		24,814		24,702
Gross profit	54,323		49,297		46,188		43,687		43,996		39,125		36,306		34,203
Operating expenses:
Research and development ⁽¹⁾⁽²⁾	12,168		11,665		10,811		10,546		8,451		9,582		8,367		7,772
Sales and marketing ⁽¹⁾⁽²⁾	25,627		25,014		23,250		21,701		18,793		17,818		17,912		17,478
General and administrative ⁽¹⁾⁽²⁾	13,496		12,146		12,042		11,762		10,766		10,746		9,833		9,103
Total operating expenses	51,291		48,825		46,103		44,009		38,010		38,146		36,112		34,353
Income (loss) from operations	3,032		472		85		(322)		5,986		979		194		(150)
Other income (expense), net:

Interest expense	(3,506)		(3,486)		(3,406)		(3,396)		(3,462)		(3,595)		(2,378)		(810)
Interest income and other	1,384		1,460		1,490		1,745		1,359		1,352		206		398
Total other income (expense), net	(2,122)		(2,026)		(1,916)		(1,651)		(2,103)		(2,243)		(2,172)		(412)
Income (loss) before income taxes	910		(1,554)		(1,831)		(1,973)		3,883		(1,264)		(1,978)		(562)
Provision for income taxes	74		50		29		(49)		150		41		64		45
Net income (loss)	$	836	$	(1,604)	$	(1,860)	$	(1,924)	$	3,733	$	(1,305)	$	(2,042)	$	(607)
Net income (loss) per share:
Basic	$	0.01	$	(0.03)	$	(0.03)	$	(0.03)	$	0.06	$	(0.02)	$	(0.04)	$	(0.01)
Diluted	$	0.01	$	(0.03)	$	(0.03)	$	(0.03)	$	0.06	$	(0.02)	$	(0.04)	$	(0.01)
Shares used in computing net income (loss) per share:
Basic	61,253		60,781		60,058		59,367		58,926		58,454		57,903		56,399
Diluted	65,962		60,781		60,058		59,367		62,071		58,454		57,903		56,399

(1) Included stock-based compensation as follows:


	Quarter Ended
	Dec. 31, 2019		Sept. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sept. 30, 2018		Jun. 30, 2018		Mar. 31, 2018

	(unaudited, in thousands)
Cost of revenue	$	1,745	$	1,702	$	1,658	$	1,229	$	942	$	860	$	853	$	678
Research and development	2,259		2,022		1,907		1,470		1,010		2,352		1,064		877
Sales and marketing	3,353		3,017		2,749		2,249		1,747		1,613		1,585		1,362
General and administrative	4,511		4,334		4,122		3,738		3,794		4,044		3,295		2,408
Total stock-based compensation	$	11,868	$	11,075	$	10,436	$	8,686	$	7,493	$	8,869	$	6,797	$	5,325

(2) Included depreciation and amortization expenses as follows:


	Quarter Ended
	Dec. 31, 2019		Sept. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sept. 30, 2018		Jun. 30, 2018		Mar. 31, 2018

	(unaudited, in thousands)
Cost of revenue	$	3,384	$	2,602	$	2,504	$	2,366	$	2,129	$	2,021	$	1,864	$	1,794
Research and development	461		450		450		440		331		278		233		194
Sales and marketing	2		2		1		1		6		30		30		29
General and administrative	477		443		406		385		372		338		322		303
Total depreciation and amortization	$	4,324	$	3,497	$	3,361	$	3,192	$	2,838	$	2,667	$	2,449	$	2,320