CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 52,256	$ 51,232
Accounts receivable, net	5,558	4,743
Prepaid expenses and other current assets	469	483
Total current assets	58,283	56,458
Property and equipment, net	4,816	4,977
Investments	858	869
Deferred tax assets	998	999
Other assets	206	316
Total assets	65,161	63,619
Current liabilities:
Accounts payable	1,055	234
Accrued expenses	991	952
Accrued income taxes		236
Deferred revenue	4,407	5,885
Total current liabilities	6,453	7,307
Long-term deferred revenue	211	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 22,916,561 as of June 30, 2016 and 22,935,988 as of December 31, 2015	229	229
Additional paid-in capital	103,226	102,968
Accumulated other comprehensive loss	(76)	(64)
Accumulated deficit	(44,882)	(46,952)
Total stockholders' equity	58,497	56,181
Total liabilities and stockholders' equity	$ 65,161	$ 63,619

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.