Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 9,870	$ 20,594
Short-term marketable securities	96,410	93,001
Accounts receivable, net	54,090	66,729
Prepaid expenses and other current assets	13,135	13,490
Total current assets	173,505	193,814
Marketable securities, noncurrent	6,429	7,542
Property and equipment, net	12,747	12,986
Goodwill	29,753	29,753
Intangible assets, net	4,546	9,448
Other assets	8,165	9,314
Total assets	235,145	262,857
Current liabilities:
Accounts payable	3,684	3,565
Accrued payroll and related liabilities	6,954	6,622
Other accrued liabilities	7,842	8,246
Deferred revenue, current	131,850	128,592
Term debt, current	2,400	2,400
Total current liabilities	152,730	149,425
Deferred revenue, less current portion	16,392	31,947
Term debt, less current portion	1,200	3,600
Other long-term liabilities	2,682	1,288
Total liabilities	$ 173,004	$ 186,260
Commitments and contingencies (Note 13)
Stockholders’ Equity:
Common stock, $0.0001 par value. Authorized 290,000 shares; issued - 82,820 shares at December 31, 2015 and 80,342 at December 31, 2014; outstanding - 76,395 at December 31, 2015 and 73,917 at December 31, 2014	$ 7	$ 7
Less treasury stock at cost	(3,352)	(3,352)
Additional paid-in capital	384,164	363,587
Accumulated deficit	(318,537)	(283,684)
Accumulated other comprehensive income (loss)	(141)	39
Total stockholders’ equity	62,141	76,597
Total liabilities and stockholders’ equity	$ 235,145	$ 262,857