Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 70,136	$ 53,331
Marketable investments (Note 3)	63,104	47,775
Accounts receivable, net	36,024	67,355
Deferred commissions	9,639	13,529
Prepaid expenses and other current assets	12,590	15,737
Total current assets	191,493	197,727
Property and equipment, net	24,846	27,569
Goodwill	74,607	74,071
Intangible assets, net	1,705	2,334
Other assets	16,988	17,290
Total assets	309,639	318,991
Current Liabilities:
Accounts payable	634	525
Accrued expenses and other current liabilities	29,654	41,252
Deferred revenue	126,178	140,676
Total current liabilities	156,466	182,453
Non-current liabilities	10,254	9,236
Total liabilities	166,720	191,689
Stockholders' Equity (Note 7):
Preferred stock, $0.01 par value Authorized - 500 shares, issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 21,517 and 21,063 shares as of September 30, 2016 and December 31, 2015, respectively Outstanding 18,207 and 17,752 shares as of September 30, 2016 and December 31, 2015, respectively	215	211
Additional paid-in capital	148,411	134,967
Retained earnings	119,300	117,135
Treasury stock - 3,311 shares as of September 30, 2016 and December 31, 2015, at cost	(120,185)	(120,185)
Accumulated other comprehensive loss	(4,822)	(4,826)
Total stockholders’ equity	142,919	127,302
Total liabilities and stockholders’ equity	$ 309,639	$ 318,991