Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 1,044	$ 586
Reconciliation of net income to net cash provided by operating activities
Deferred income taxes	(302)	(51)
Share based earn-out liability	(365)
Depreciation and amortization of property and equipment	1,626	1,541
Amortization of intangible assets	1,161	845
Provision for doubtful accounts	304	138
Stock-based compensation	1,927	1,499
Changes in assets and liabilities
Accounts receivable	(2,189)	(594)
Deferred costs	(765)	(863)
Other current and non-current assets	99	(105)
Accounts payable	1,694	(477)
Accrued compensation	(319)	420
Accrued expenses	(90)	347
Deferred revenue	3,019	(78)
Deferred rent	67	(146)
Net cash provided by operating activities	6,911	3,062
Cash flows from investing activities
Purchases of property and equipment	(2,116)	(2,308)
Purchases of marketable securities	(2,495)
Maturities of marketable securities	2,500
Business acquisitions, net of cash acquired	(17,942)
Net cash used in investing activities	(20,053)	(2,308)
Cash flows from financing activities
Net proceeds from exercise of options to purchase common stock	1,069	2,047
Excess tax benefit from exercise of options to purchase common stock	1,021	300
Net cash provided by financing activities	2,090	2,347
Effect of foreign currency exchange rate changes	403	(346)
Net increase (decrease) in cash and cash equivalents	(10,649)	2,755
Cash and cash equivalents at beginning of period	121,538	130,795
Cash and cash equivalents at end of period	$ 110,889	$ 133,550