CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 48,963	$ 51,608
Accounts receivable, net	5,359	2,389
Unbilled receivables	2,155	1,429
Prepaid expenses and other current assets	386	216
Total current assets	56,863	55,642
Property and equipment, net	4,128	4,304
Deferred tax assets	5,199	5,071
Other assets		18
Total assets	66,190	65,035
Current liabilities:
Accounts payable	160	166
Accrued expenses	1,685	1,401
Accrued income taxes	48	2
Deferred revenue	3,038	2,805
Total current liabilities	4,931	4,374
Long-term deferred revenue	77	127
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 21,545,113 as of September 30, 2018 and 21,493,440 as of December 31, 2017	215	215
Additional paid-in capital	96,299	96,246
Accumulated deficit	(35,332)	(35,927)
Total stockholders' equity	61,182	60,534
Total liabilities and stockholders' equity	$ 66,190	$ 65,035

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682