CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (232)	$ 3,123
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Stock-based compensation expense	3,051	2,155
Depreciation	2,050	1,628
Amortization of intangibles	418	77
Deferred income taxes	358	(632)
Provision for doubtful accounts, net		20
CHANGES IN OPERATING ASSETS AND LIABILITIES:
Accounts receivable	(798)	3,199
Prepaid expenses and other current assets	(2,600)	(831)
Deferred implementation costs	16	20
Security deposits	(3)	(184)
Other assets
Accounts payable	(1,550)	1,991
Accrued expenses	(1,580)	140
Deferred revenue	220	923
Net cash (used in) provided by operating activities	(650)	11,629
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(1,664)	(1,730)
Acquisition of domains	(50)
Net cash used in investing activities	(1,714)	(1,730)
CASH FLOWS FROM FINANCING ACTIVITIES:
Excess tax benefit from the exercise of employee stock options	(6)	608
Proceeds from issuance of common stock in connection with the exercise of options	1,347	4,109
Repurchase of common stock	(7,428)
Net cash (used in) provided by financing activities	(6,087)	4,717
Effect of foreign exchange rate changes on cash and cash equivalents	(55)	(5)
Net (decrease) increase in cash and cash equivalents	(8,506)	14,611
Cash and cash equivalents at the beginning of the period	103,339	93,278
Cash and cash equivalents at the end of the period	$ 94,833	$ 107,889