CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 4,756	$ 2,371
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,666	3,525
Stock-based compensation expense	3,117	2,998
Deferred income taxes	658	36
Excess tax benefits from stock-based awards	(859)	(1,243)
Allowance for doubtful accounts	1,157	443
Other non-cash charges	246	404
Changes in operating assets and liabilities:
Increase in accounts receivable	(4,747)	(4,171)
Decrease in prepaid expenses and other assets, net	1,953	890
Decrease in accounts payable and accrued expenses	(717)	(1,519)
(Decrease) increase in deferred revenue	(426)	475
Decrease in deferred rent	(240)	(361)
(Decrease) increase in other liabilities, net	(119)	30
Net cash provided by operating activities	7,445	3,878
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(469)	(562)
Additions to capitalized software	(1,567)	(2,082)
Maturity of U.S. Treasury Bills	2,600	2,599
Purchases of U.S. Treasury Bills	(2,595)	(2,599)
Proceeds from the sale of property and equipment	185	0
Payment to acquire investment	0	(4,000)
Other investing activities	(45)	(35)
Acquisitions, net of cash acquired	0	(5,724)
Net cash used in investing activities	(1,891)	(12,403)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(8,807)	(615)
Proceeds pursuant to employee stock-based compensation plans	186	705
Excess tax benefits from stock-based awards	859	1,243
Surrender of restricted common stock for income tax purposes	(2,149)	(4,147)
Net cash used in financing activities	(9,911)	(2,814)
Decrease in cash and cash equivalents	(4,357)	(11,339)
Cash and cash equivalents at beginning of period	89,955	90,697
Cash and cash equivalents at end of period	$ 85,598	$ 79,358