CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,612	$ 1,285
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,638	1,658
Stock-based compensation expense	1,734	1,874
Deferred income taxes	329	977
Allowance for doubtful accounts	74	121
Loss in equity interest	22	117
Changes in operating assets and liabilities:
Decrease in accounts receivable	2,353	1,070
Increase in prepaid expenses and other assets, net	(897)	(1,368)
Decrease in accrued compensation and employee benefits	(3,132)	(2,553)
(Decrease) / increase in accounts payable and accrued expenses	280	808
Increase in deferred revenue	1,101	1,161
Decrease in deferred rent	(198)	(117)
(Decrease) / increase in other liabilities, net	(370)	2
Net cash provided by operating activities	6,546	5,035
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(1,178)	(12)
Additions to capitalized software	(1,607)	(1,200)
Net cash used in investing activities	(2,785)	(1,212)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	0	(5,077)
Proceeds pursuant to employee stock purchase plans	456	389
Proceeds from exercise of stock options	705	392
Taxes paid related to net share settlements of stock-based compensation awards	(1,607)	(2,218)
Net cash used in financing activities	(446)	(6,514)
Increase/(decrease) in cash and cash equivalents	3,315	(2,691)
Cash and cash equivalents at beginning of period	106,092	105,703
Cash and cash equivalents at end of period	$ 109,407	$ 103,012