Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 46,015	$ 69,232
Expenses:
Cost of revenue	14,688	16,783
Sales and marketing	14,628	21,278
Technology and development	12,753	12,443
General and administrative	15,080	20,605
Restructuring and other exit costs	4,338	0
Total expenses	61,487	71,109
Loss from operations	(15,472)	(1,877)
Other (income) expense:
Interest income, net	(167)	(94)
Other income	212	0
Foreign exchange loss, net	372	261
Total other (income) expense, net	(7)	167
Loss before income taxes	(15,465)	(2,044)
Provision (benefit) for income taxes	375	(4,328)
Net income (loss)	$ (15,840)	$ 2,284
Net income (loss) per share:
Basic (usd per share)	$ (0.33)	$ 0.05
Diluted (usd per share)	$ (0.33)	$ 0.05
Net income (loss) per share:
Basic (in shares)	48,332	44,663
Diluted (in shares)	48,332	48,676