Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 131,744	$ 115,877
Short-term marketable securities	26,896	23,076
Accounts receivable, less allowance for doubtful accounts of $790 and $515, respectively	21,545	20,746
Deferred costs	21,917	19,224
Other current assets	6,955	7,010
Total current assets	209,057	185,933
PROPERTY AND EQUIPMENT, net	15,527	15,314
GOODWILL	50,766	49,777
INTANGIBLE ASSETS, net	18,484	19,788
MARKETABLE SECURITIES, non-current	4,997	7,494
OTHER ASSETS
Deferred costs, non-current	6,419	6,086
Deferred income tax asset, non-current	27,524	12,446
Other non-current assets	1,098	1,527
Total assets	333,872	298,365
CURRENT LIABILITIES
Accounts payable	2,720	2,302
Accrued compensation	13,243	13,740
Accrued expenses	3,723	3,508
Deferred revenue	16,624	11,055
Deferred rent	1,606	1,556
Total current liabilities	37,916	32,161
OTHER LIABILITIES
Deferred revenue, non-current	11,050	10,847
Deferred rent, non-current	3,899	4,179
Deferred income tax liability, non-current	1,977	1,911
Total liabilities	54,842	49,098
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; 17,221,798 and 17,081,145 shares issued and outstanding, respectively	17	17
Additional paid-in capital	292,533	286,315
Accumulated deficit	(12,665)	(33,739)
Accumulated other comprehensive loss	(855)	(3,326)
Total stockholders' equity	279,030	249,267
Total liabilities and stockholders' equity	$ 333,872	$ 298,365