CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 36,040	$ 38,565
Accounts receivable, net of allowance for doubtful accounts of $138 at March 31, 2021 and December 31, 2020	2,872	2,285
Unbilled receivables	2,482	2,229
Prepaid expenses and other current assets	531	582
Total current assets	41,925	43,661
Property and equipment, net	3,567	3,701
Intangible assets, net	1,174	1,217
Goodwill	1,651	1,651
Long-term tax receivable	1,398	1,398
Total assets	49,715	51,628
Current liabilities:
Accounts payable	504	494
Accrued expenses	1,303	1,531
Deferred revenue	3,417	3,843
Total current liabilities	5,224	5,868
Long-term deferred revenue	126	90
Commitments and contingent liabilities	0	0
Stockholders’ equity:
Preferred stock, $1.00 par value; 1,000,000 shares authorized, none outstanding	0	0
Common stock, $.01 par value; 70,000,000 shares authorized; issued and outstanding of 21,494,236 as of March 31, 2021 and 21,378,833 as of December 31, 2020	215	214
Additional paid-in capital	96,246	96,104
Accumulated deficit	(52,096)	(50,648)
Total stockholders’ equity	44,365	45,670
Total liabilities and stockholders’ equity	$ 49,715	$ 51,628