CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 13,191	$ 6,276
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,664	5,234
Stock-based compensation expense	5,995	6,037
Deferred income taxes	987	1,781
Allowance for doubtful accounts	141	1,164
Loss in equity interests	67	1,204
Changes in operating assets and liabilities:
(Increase)/decrease in accounts receivable, net	(2,193)	1,691
Increase in prepaid expenses and other assets, net	(84)	(871)
Decrease in accrued compensation and employee benefits	(844)	(2,045)
Increase in accounts payable, accrued expenses, and other	3,108	321
Increase/(decrease) in deferred revenue	1,196	(2,442)
Decrease in deferred rent	(580)	(474)
Decrease in other liabilities, net	(974)	(635)
Net cash provided by operating activities	24,674	17,241
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(1,438)	(217)
Additions to capitalized software	(4,813)	(3,346)
Maturity of U.S. Treasury Bills	1,245	1,248
Purchases of U.S. Treasury Bills and Investments	(1,219)	(1,232)
Acquisitions, net of cash acquired	0	(3,150)
Other investing activities	(250)	(113)
Net cash used in investing activities	(6,475)	(6,810)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchase of common stock	0	(13,322)
Proceeds pursuant to employee stock purchase plans	865	796
Proceeds from exercise of stock options	714	392
Taxes paid related to net share settlements of stock-based compensation awards	(2,830)	(3,204)
Net cash used in financing activities	(1,251)	(15,338)
Increase/(decrease) in cash and cash equivalents	16,948	(4,907)
Cash and cash equivalents at beginning of period	106,092	105,703
Cash and cash equivalents at end of period	$ 123,040	$ 100,796