Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 69,232	$ 37,178
Expenses:
Cost of revenue	16,783	6,561
Sales and marketing	21,278	15,049
Technology and development	12,443	8,414
General and administrative	20,605	14,279
Total expenses	71,109	44,303
Loss from operations	(1,877)	(7,125)
Other (income) expense
Interest (income) expense, net	94	(12)
Foreign exchange (gain) loss, net	(261)	2,190
Total other (income) expense, net	(167)	2,178
Loss before income taxes	(2,044)	(4,947)
Provision (benefit) for income taxes	(4,328)	84
Net income (loss)	$ 2,284	$ (5,031)
Earnings Per Share, Basic	$ 0.05	$ (0.14)
Earnings Per Share, Diluted	$ 0.05	$ (0.14)
Weighted Average Number of Shares Outstanding, Basic	44,663	35,758
Weighted Average Number of Shares Outstanding, Diluted	48,676	35,758