CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 8,698	$ 7,622
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,815	4,027
Stock-based compensation expense	5,801	4,252
Deferred income taxes	1,035	987
Excess tax benefits from stock-based awards	(494)	(979)
Allowance for doubtful accounts	314	1,527
Other non-cash charges	223	420
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	1,816	(5,826)
(Increase) decrease in prepaid expenses and other assets, net	(870)	1,740
Decrease in accrued compensation and benefits	(287)	(1,900)
Increase in accounts payable and accrued expenses	1,569	1,134
Decrease in deferred revenue	(1,997)	(917)
Decrease in deferred rent	(544)	(493)
Increase (decrease) in other liabilities, net	9	(35)
Net cash provided by operating activities	20,088	11,559
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(93)	(391)
Additions to capitalized software	(2,954)	(2,386)
Maturity of U.S. Treasury Bills	2,490	2,600
Purchases of US Treasury Bills	(2,490)	(2,595)
Proceeds from the sale of property and equipment	0	185
Payments to Acquire Investments	(295)	(2,500)
Acquisitions	1,359	0
Other investing activities	(200)	(53)
Net cash used in investing activities	(4,901)	(5,140)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	(2,495)	(8,807)
Proceeds pursuant to employee stock-based compensation plans	880	497
Excess tax benefits from stock-based awards	494	979
Surrender of restricted common stock for income tax purposes	(2,505)	(2,725)
Net cash used in financing activities	(3,626)	(10,056)
Increase (decrease) in cash and cash equivalents	11,561	(3,637)
Cash and cash equivalents at beginning of period	88,509	89,955
Cash and cash equivalents at end of period	100,070	86,318
Income Taxes Paid, Net	$ 2,849	$ 2,420