Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income	$ 517	$ 2,061
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	1,091	765
Stock-based compensation expense	2,884	2,666
Amortization of acquired intangible assets	188	213
Deferred taxes	(580)	458
Loss on disposal of property and equipment		107
Provision for doubtful accounts		53
Unrealized loss (gain) on foreign currency forward contract	92	(23)
Changes in operating assets and liabilities:
Accounts receivable, net of allowance	(1,931)	4,062
Prepaid expenses and other current assets	(1,395)	178
Accounts payable	476	250
Accrued compensation and related benefits	(1,040)	(564)
Accrued and other liabilities	(587)	(833)
Deferred revenues	1,734	1,674
Billings in excess of recognized revenues	112	(1,153)
Other non-current assets	(1,977)	(5,917)
Net cash (used in) provided by operating activities	(416)	3,997
Investing activities:
Purchases of property and equipment	(2,313)	(1,780)
Net cash used in investing activities	(2,313)	(1,780)
Financing activities:
Proceeds from exercise of stock options	717	182
Proceeds from employee stock purchase plan	909	777
Payments for taxes related to net share settlement of equity awards	(844)	(9)
Net cash provided by financing activities	782	950
Effect of exchange rate changes on cash and cash equivalents	86	73
Net change in cash and cash equivalents	(1,861)	3,240
Cash and cash equivalents, beginning of period	116,787	126,158
Cash and cash equivalents, end of period	114,926	129,398
Supplemental disclosure of cash flow information:
Taxes	681	281
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 885	$ 1,218