CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 51,608	$ 51,913
Accounts receivable (less allowance for doubtful accounts of $20 at December 31, 2017 and 2016)	2,401	3,016
Prepaid expenses and other current assets	203	268
Total current assets	54,212	55,197
Property and equipment, net	4,304	4,634
Investments		951
Deferred tax assets	5,402	1,078
Other assets	18	124
Total assets	63,936	61,984
Current liabilities:
Accounts payable	166	135
Accrued expenses	1,184	1,075
Accrued income taxes	2
Deferred revenue	2,805	2,722
Total current liabilities	4,157	3,932
Long-term deferred revenue	127	211
Commitments and contingent liabilities (Note 8)
Stockholders' equity:
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding
Common stock, $.01 par value; shares authorized, 70,000,000 in 2017 and 2016; issued and outstanding 21,493,440 as of December 31, 2017 and 22,370,713 as of December 31, 2016	215	224
Additional paid-in capital	96,246	100,485
Accumulated other comprehensive loss		(19)
Accumulated deficit	(36,809)	(42,849)
Total stockholders' equity	59,652	57,841
Total liabilities and stockholders' equity	$ 63,936	$ 61,984