Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 19,251	$ 9,870
Short-term marketable securities	93,424	96,410
Accounts receivable, net of allowances of $1,244 and $1,170	37,651	54,090
Prepaid expenses and other current assets	12,369	13,135
Total current assets	162,695	173,505
Marketable securities, noncurrent	7,537	6,429
Property and equipment, net of accumulated depreciation of $37,824 and $36,344	11,359	12,747
Goodwill	29,753	29,753
Intangible assets, net of accumulated amortization of $23,330 and $22,292	3,508	4,546
Other assets	7,349	8,165
Total assets	222,201	235,145
Current liabilities:
Accounts payable	6,906	3,684
Accrued payroll and related liabilities	6,967	6,954
Other accrued liabilities	6,167	7,842
Deferred revenue, current	123,833	131,850
Term debt, current	2,400	2,400
Total current liabilities	146,273	152,730
Deferred revenue, less current portion	14,128	16,392
Term debt, less current portion	600	1,200
Other long-term liabilities	2,656	2,682
Total liabilities	$ 163,657	$ 173,004
Commitments and contingencies (Note 9)
Stockholders’ Equity:
Common stock, $0.0001 par value. Authorized 290,000 shares; issued – 83,018 shares at March 31, 2016 and 82,820 at December 31, 2015; outstanding – 76,592 at March 31, 2016 and 76,395 at December 31, 2015	$ 7	$ 7
Less treasury stock at cost	(3,352)	(3,352)
Additional paid-in capital	387,712	384,164
Accumulated deficit	(325,946)	(318,537)
Accumulated other comprehensive income (loss)	123	(141)
Total stockholders’ equity	58,544	62,141
Total liabilities and stockholders’ equity	$ 222,201	$ 235,145