Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 125,385	$ 123,127
Short-term investments	47,352	40,192
Accounts receivable, less allowance for doubtful accounts of $864 and $763, respectively	28,171	24,897
Deferred costs	32,216	29,966
Other current assets	6,762	6,149
Total current assets	239,886	224,331
PROPERTY AND EQUIPMENT, net	18,136	16,856
GOODWILL	50,403	51,613
INTANGIBLE ASSETS, net	14,354	16,529
INVESTMENTS	4,922	5,206
OTHER ASSETS
Deferred costs	10,328	9,967
Deferred income tax asset	12,061	13,697
Other assets	1,583	1,539
Total assets	351,673	339,738
CURRENT LIABILITIES
Accounts payable	3,709	4,463
Accrued compensation	14,347	15,228
Accrued expenses	4,758	4,712
Deferred revenue	24,191	17,863
Deferred rent	1,373	1,679
Total current liabilities	48,378	43,945
OTHER LIABILITIES
Deferred revenue	2,640	2,731
Deferred rent	4,290	3,064
Deferred income tax liability	1,676	1,887
Total liabilities	56,984	51,627
COMMITMENTS and CONTINGENCIES
STOCKHOLDERS’ EQUITY
Preferred stock, $0.001 par value; 5,000,000 shares authorized; 0 shares issued and outstanding
Common stock, $0.001 par value; 55,000,000 shares authorized; 17,475,360 and 17,249,153 shares issued; and 17,159,819 and 17,127,006 outstanding, respectively	17	17
Treasury stock, at cost; 315,541 and 122,147 shares, respectively	(17,684)	(5,815)
Additional paid-in capital	313,887	301,863
Retained earnings (accumulated deficit)	59	(8,611)
Accumulated other comprehensive (loss) income	(1,590)	657
Total stockholders’ equity	294,689	288,111
Total liabilities and stockholders’ equity	$ 351,673	$ 339,738