Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Consumer revenue	$ 340,121	$ 254,678	$ 193,949
Enterprise revenue	29,537	21,750
Total revenue	369,658	276,428	193,949
Cost of services	100,065	79,916	62,630
Gross profit	269,593	196,512	131,319
Costs and expenses:
Sales and marketing	162,363	122,989	91,217
Technology and development	40,015	29,543	17,749
General and administrative	42,125	24,629	17,510
Amortization of acquired intangible assets	7,909	6,258	0
Total costs and expenses	252,412	183,419	126,476
Income from operations	17,181	13,093	4,843
Other income (expense):
Interest expense	(353)	(3,677)	(231)
Interest income	124	30	8
Change in fair value of warrant liabilities	0	3,117	(8,658)
Change in fair value of embedded derivative	0	(2,785)	0
Other	(21)	(5)	(5)
Total other expense	(250)	(3,320)	(8,886)
Income (loss) before provision for income taxes	16,931	9,773	(4,043)
Income tax (benefit) expense	(37,524)	(13,730)	214
Net income (loss)	54,455	23,503	(4,257)
Accretion of convertible redeemable preferred stock	0	(9,378)	(18,926)
Beneficial conversion feature on convertible redeemable preferred stock	0	(2,452)	0
Net income allocable to convertible redeemable preferred stockholders	0	(5,504)	0
Net income available (loss attributable) to common stockholders	$ 54,455	$ 6,169	$ (23,183)
Net income available (loss attributable) per share to common stockholders:
Basic	$ 0.61	$ 0.18	$ (1.24)
Diluted	$ 0.57	$ 0.09	$ (1.24)
Weighted-average common shares outstanding:
Basic	88,636	35,082	18,725
Diluted	96,047	62,191	18,725