Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 82,278	$ 78,669
Accounts receivable, net of allowance of $243 and $193 at March 31, 2016 and December 31, 2015, respectively	5,842	6,425
Prepaid expenses and other current assets	1,276	1,225
Total current assets	89,396	86,319
Property and equipment, net	33,970	34,214
Restricted cash	2,839	2,839
Goodwill	52,848	52,848
Intangible assets, net	7,182	7,965
Other assets	163	157
Total assets	186,398	184,342
Current liabilities:
Accounts payable	1,956	2,701
Accrued expenses	9,887	11,378
Deferred revenue, short-term	42,828	40,089
Total current liabilities	54,671	54,168
Deferred revenue, long-term	3,426	3,724
Other long-term liabilities	2,194	2,040
Total liabilities	60,291	59,932
Stockholders’ equity:
Common stock, $.001 par value; 90,000 shares authorized; 26,875 and 26,861 shares issued and 26,205 and 26,190 shares outstanding at March 31, 2016 and December 31, 2015, respectively	26	26
Additional paid in capital	364,578	361,370
Treasury stock, at cost; 670 and 671 shares at March 31, 2016 and December 31, 2015, respectively	(10,284)	(10,309)
Accumulated other comprehensive loss	(663)	(662)
Accumulated deficit	(227,550)	(226,015)
Total stockholders’ equity	126,107	124,410
Total liabilities and stockholders’ equity	$ 186,398	$ 184,342