CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 51,612	$ 51,608
Accounts receivable (less allowance for doubtful accounts of $20 at December 31, 2018 and 2017)	2,010	2,389
Unbilled receivables	3,279	1,429
Prepaid expenses and other current assets	284	216
Total current assets	57,185	55,642
Property and equipment, net	4,085	4,304
Deferred tax assets	5,171	5,071
Other assets		18
Total assets	66,441	65,035
Current liabilities:
Accounts payable	126	166
Accrued expenses	1,319	1,401
Accrued income taxes		2
Deferred revenue	3,024	2,805
Total current liabilities	4,469	4,374
Long-term deferred revenue	75	127
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 2018 and 2017; issued and outstanding 21,515,872 as of December 31, 2018 and 21,493,440 as of December 31, 2017	215	215
Additional paid-in capital	96,376	96,246
Accumulated deficit	(34,694)	(35,927)
Total stockholders' equity	61,897	60,534
Total liabilities and stockholders' equity	$ 66,441	$ 65,035