CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES:
Net loss	$ (10,429)	$ (7,412)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	5,345	5,906
Depreciation	6,794	5,660
Amortization of purchased intangibles	3,335	4,169
Deferred income taxes and other non-cash tax items	144	(1,114)
Provision for doubtful accounts, net	707	1,037
Changes in operating assets and liabilities:
Accounts receivable	1,032	(1,913)
Prepaid expenses and other current assets	(2,762)	(2,902)
Other assets	(6)	(16)
Accounts payable	(1,056)	1,817
Accrued expenses and other current liabilities	(5,101)	(5,516)
Deferred revenue	15,593	351
Other liabilities	1,166	263
Net cash provided by operating activities	14,762	330
INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(6,646)	(8,442)
Cash held as collateral for foreign exchange forward contracts	1,448	(5,464)
Payments for (Proceeds from) Previous Acquisition	0	(150)
Net cash used in investing activities	(5,198)	(14,056)
FINANCING ACTIVITIES:
Excess tax benefit from the exercise of employee stock options	0	757
Proceeds from issuance of common stock in connection with the exercise of options	655	3,105
Repurchase of common stock	(4,571)	(2,534)
Net cash (used in) provided by financing activities	(3,916)	1,328
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(2,125)	65
CHANGE IN CASH AND CASH EQUIVALENTS	3,523	(12,333)
CASH AND CASH EQUIVALENTS - Beginning of the period	48,803	49,372
CASH AND CASH EQUIVALENTS - End of the period	52,326	37,039
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW INFORMATION:
Cash paid for income taxes	923	1,122
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment recorded in accounts payable	187	580
Leasehold improvements funded by landlord	$ 144	$ 0