CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 52,650	$ 51,232
Accounts receivable, net	3,839	4,743
Prepaid expenses and other current assets	677	483
Total current assets	57,166	56,458
Property and equipment, net	4,874	4,977
Investments	869	869
Deferred tax assets	872	999
Other assets	261	316
Total assets	64,042	63,619
Current liabilities:
Accounts payable	616	234
Accrued expenses	823	952
Accrued income taxes		236
Deferred revenue	5,102	5,885
Total current liabilities	6,541	7,307
Long-term deferred revenue	$ 311	$ 131
Commitments and contingent liabilities
Stockholders' equity:
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding
Common stock, $.01 par value; 70,000,000 shares authorized; issued and outstanding 22,993,139 as of March 31, 2016 and 22,935,988 as of December 31, 2015	$ 230	$ 229
Additional paid-in capital	103,345	102,968
Accumulated other comprehensive loss	(67)	(64)
Accumulated deficit	(46,318)	(46,952)
Total stockholders' equity	57,190	56,181
Total liabilities and stockholders' equity	$ 64,042	$ 63,619