Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 140,296	$ 79,790
Marketable investments (Note 4)		54,333
Accounts receivable, net (Note 13)	67,318	70,023
Deferred commissions	15,677	13,731
Prepaid expenses and other current assets	12,802	18,942
Total current assets	236,093	236,819
Property and equipment, net (Note 13)	22,005	25,249
Goodwill (Note 3)	85,165	76,169
Intangible assets, net (Note 3)	4,951	732
Other assets	5,310	6,231
Total assets	353,524	345,200
Current Liabilities:
Accounts payable	588	217
Accrued expenses and other current liabilities (Note 13)	54,065	49,629
Deferred revenue	135,332	145,207
Total current liabilities	189,985	195,053
Non-current liabilities	11,939	8,958
Total liabilities	201,924	204,011
Commitments (Note 8)
Stockholders' Equity (Note 9):
Preferred stock, $0.01 par value Authorized - 500 shares; issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 22,951 and 22,432 shares as of December 31, 2018 and 2017, respectively Outstanding - 18,320 and 18,041 shares as of December 31, 2018 and 2017, respectively	230	224
Additional paid-in capital	200,696	181,910
Retained earnings	127,717	123,010
Treasury stock - 4,631 and 4,391 shares as of December 31, 2018 and 2017, respectively, at cost	(171,889)	(161,943)
Accumulated other comprehensive loss	(5,154)	(2,012)
Total stockholders’ equity	151,600	141,189
Total liabilities and stockholders’ equity	$ 353,524	$ 345,200