CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net loss	$ (2,058)	$ (794)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,794	2,697
Depreciation	2,578	1,981
Amortization of purchased intangibles	2,152	1,058
Deferred income taxes and other non-cash tax items	820	(76)
Provision for doubtful accounts, net	403	271
Changes in operating assets and liabilities:
Accounts receivable	(4,609)	48
Prepaid expenses and other current assets	(2,544)	(3,930)
Other assets	(15)	460
Accounts payable	1,359	1,114
Accrued expenses and other current liabilities	(7,045)	(3,828)
Deferred revenue	(1,776)	(1,586)
Other liabilities	361	(414)
Net cash used in operating activities	(7,580)	(2,999)
INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(1,783)	(1,456)
Investment in technology licenses	0	(3,174)
Payments for acquisitions and intangible assets, net of cash acquired	0	(125)
Net cash used in investing activities	(1,783)	(4,755)
FINANCING ACTIVITIES:
Excess tax benefit from the exercise of employee stock options	751	0
Proceeds from issuance of common stock in connection with the exercise of options	2,284	2,978
Repurchase of common stock	(2,058)	(7,841)
Net cash provided by (used in) financing activities	977	(4,863)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(150)	84
CHANGE IN CASH AND CASH EQUIVALENTS	(8,536)	(12,533)
CASH AND CASH EQUIVALENTS - Beginning of the period	49,372	91,906
CASH AND CASH EQUIVALENTS - End of the period	40,836	79,373
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW INFORMATION:
Cash paid for income taxes	583	1,037
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment recorded in accounts payable	2,224	1,174
Acquisition costs in connection with NexGraph recorded in accrued expenses	$ 0	$ 375