Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 42,431	$ 39,416	$ 133,176	$ 115,198
Cost of revenue	14,554	11,121	39,936	33,676
Gross profit	27,877	28,295	93,240	81,522
Marketing	9,977	7,193	30,426	23,331
Technology and development	11,758	10,018	34,978	26,669
Customer service and operations	5,021	4,403	14,428	12,748
General and administrative	16,639	5,741	31,769	15,716
Total operating expense	43,395	27,355	111,601	78,464
Income from operations	(15,518)	940	(18,361)	3,058
Other income (expense):
Interest expense	(370)	(351)	(1,064)	(1,023)
Interest income	83	59	231	204
Other income (expense)	(165)	(220)	(295)	(30)
Income (loss) before income taxes	(15,970)	428	(19,489)	2,209
Provision for income taxes	43	30	123	61
Net income (loss)	$ (16,013)	$ 398	$ (19,612)	$ 2,148
Net income (loss) per share:
Basic	$ (0.41)	$ 0.01	$ (0.50)	$ 0.06
Diluted	$ (0.41)	$ 0.01	$ (0.50)	$ 0.05
Weighted-average shares used to compute net income (loss) per share:
Basic	39,448	38,347	39,147	38,085
Diluted	39,448	41,765	39,147	41,701