CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (7,171)	$ (9,699)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation expense	1,587	1,095
Amortization of intangible assets	1,394	1,271
Provision for doubtful accounts and service remediation reserves	47	(167)
Stock-based compensation	6,040	3,051
Stock-based compensation related to acquisition	42	203
Revaluation of acquisition contingent consideration		41
Release of valuation allowance		(614)
Amortization of convertible note issuance cost	60
Net amortization on investments	173	104
Put option loss		52
Gain on investments classified as trading securities		(118)
Changes in operating assets and liabilities:
Accounts receivable	1,623	(421)
Prepaid and other current assets	2,064	(748)
Other assets	(3,172)	(702)
Accounts payable	(1,161)	(945)
Accrued expenses	931	1,348
Accrued payroll and related expenses	81	(446)
Accrued restructuring	(209)	(117)
Deferred revenue	(848)	7,008
Deferred income taxes	77	89
Net cash provided by operating activities	1,558	285
Cash flows from investing activities:
Purchases of investments	(33,569)	(6,703)
Proceeds from maturities and sale of investments	10,063	12,504
Purchases of property and equipment	(982)	(760)
Purchases of intangible assets	(1,128)	(1,554)
Acquisition, net of cash acquired	(5,860)	(1,922)
Change in restricted cash		(600)
Net cash provided by (used in) investing activities	(31,476)	965
Cash flows from financing activities:
Net proceeds from issuance of common stock	4,516	854
Repurchases of stock	(14,430)
Repurchase of common stock from employees for payment of taxes on vesting of restricted stock units	(681)	(220)
Payment of cash contingent consideration related to acquisition	(600)
Proceeds from issuance of convertible notes, net of issuance costs	77,369
Repayment of debt assumed through acquisition		(899)
Payment of principal under capital lease	(601)
Net cash provided by (used in) financing activities	65,573	(265)
Effect of exchange rates on cash and cash equivalents	35	(94)
Net increase in cash and cash equivalents	35,690	891
Cash and cash equivalents at beginning of period	12,830	11,565
Cash and cash equivalents at end of period	$ 48,520	$ 12,456