Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 39,844	$ 33,493	$ 75,782	$ 57,808
Cost of revenue	12,977	10,119	22,555	17,638
Gross profit	26,867	23,374	53,227	40,170
Marketing	7,356	6,907	16,138	12,599
Technology and development	8,801	5,476	16,651	10,310
Customer service and operations	4,371	3,325	8,345	6,342
General and administrative	4,817	3,039	9,975	5,962
Total operating expense	25,345	18,747	51,109	35,213
Income from operations	1,522	4,627	2,118	4,957
Other income (expense):
Interest expense	(344)	(499)	(672)	(946)
Interest income	69	41	145	77
Other income	170	53	190	57
Income before provision for income taxes	1,417	4,222	1,781	4,145
Provision for income taxes	19	132	31	134
Net income	$ 1,398	$ 4,090	$ 1,750	$ 4,011
Net income per share:
Basic	$ 0.04	$ 0.12	$ 0.05	$ 0.15
Diluted	$ 0.03	$ 0.11	$ 0.04	$ 0.11
Weighted-average shares used to compute net income per share
Basic	38,102	32,974	37,952	26,046
Diluted	41,622	37,263	41,667	35,865