Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net income (loss)	$ (6,743)	$ 3,419
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,196	739
Stock-based compensation expense	3,500	1,049
Excess tax benefit from stock-based compensation	0	(656)
Other non-cash items	448	300
Change in fair value of warrants	0	1,962
Unrealized foreign currency (gain) loss, net	(946)	1,169
Changes in assets and liabilities:
Accounts receivable	18,515	10,148
Prepaid expenses and other assets	(6,263)	(1,345)
Deferred revenue	2,284	2,932
Accounts payable and other liabilities	166	(2,330)
Net cash provided by operating activities	12,157	17,387
Cash flows from investing activities
Purchase of property and equipment	(5,139)	(1,074)
Acquisition, net of cash acquired	(179)	193
Net cash used in investing activities	(5,318)	(881)
Cash flows from financing activities
Proceeds from exercise and issuance of common stock options	6,127	951
Payments on line of credit and long-term debt, net	0	(2,310)
Excess tax benefit on stock-based compensation	0	656
Payments of offering costs	0	(1,769)
Net cash provided by (used in) financing activities	6,127	(2,472)
Effect of exchange rates on cash	2,825	(3,046)
Net increase in cash and cash equivalents	15,791	10,988
Cash and cash equivalents, beginning of period	158,712	24,852
Cash and cash equivalents, end of period	174,503	35,840
Supplemental cash flow information:
Cash paid during the period for interest	58	329
Cash paid during the period for income taxes	11,865	786
Non-cash investing activities:
Leasehold improvement allowance received under operating lease	1,764	0
Common stock issued for acquisition of business	$ 0	$ 622