Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 90,257	$ 67,904
Accounts receivable, net of allowance for expected credit losses of $708 and $628 as of December 31, 2020 and 2019, respectively (Note 1)	84,695	84,605
Deferred commissions	23,620	20,326
Prepaid expenses and other current assets	18,588	19,201
Total current assets	217,160	192,036
Property and equipment, net	27,032	29,937
Operating lease right-of-use assets	69,296	69,100
Goodwill	247,211	243,895
Intangible assets, net	77,995	97,363
Other assets	5,524	6,829
Total assets	644,218	639,160
Current Liabilities:
Accounts payable	657	505
Accrued expenses and other current liabilities	76,620	79,857
Current portion of long-term debt	12,500	9,375
Deferred revenue	179,968	179,194
Total current liabilities	269,745	268,931
Long-term debt, net of deferred financing fees	95,299	121,170
Non-current operating lease liabilities	70,323	67,062
Other non-current liabilities (Note 6, 13)	23,085	23,909
Total liabilities	458,452	481,072
Commitments and contingencies (Note 5, 14)
Stockholders' Equity:
Preferred stock, $0.01 par value Authorized - 500 shares; issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 23,648 and 23,275 shares as of December 31, 2020 and 2019, respectively Outstanding - 19,017 and 18,644 shares as of December 31, 2020 and 2019, respectively	236	233
Additional paid-in capital	230,128	216,454
Retained earnings	127,981	118,147
Treasury stock - 4,631 shares as of December 31, 2020 and 2019	(171,889)	(171,889)
Accumulated other comprehensive loss	(690)	(4,857)
Total stockholders’ equity	185,766	158,088
Total liabilities and stockholders’ equity	$ 644,218	$ 639,160