Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and equivalents	$ 126,484	$ 78,661
Short term investments	39,953	79,733
Accounts receivable, net of allowances of $809 in 2018 and $520 in 2017	34,445	48,126
Inventories, net	11,504	12,040
Prepaid expenses	6,478	3,876
Contract assets	4,874
Other current assets	4,547	5,501
Total current assets	228,285	227,937
Property and equipment
Furniture and fixtures	7,451	5,655
Office equipment	10,012	13,084
Property and equipment, gross	17,463	18,739
Accumulated depreciation	(11,163)	(13,963)
Property and equipment, net	6,300	4,776
Goodwill	57,025	56,332
Intangible assets, net of accumulated amortization	35,733	37,888
Deferred income taxes	4,975	5,460
Contract asset - non-current	7,488
Other assets	7,062	5,229
Total assets	346,868	337,622
Current liabilities
Accounts payable	4,822	8,144
Deferred revenue	30,433	33,295
Accrued wages and payroll taxes	10,669	11,643
Short-term income taxes payable	1,435	3,673
Other accrued expenses	9,598	7,746
Deferred compensation	395	1,652
Total current liabilities	57,352	66,153
Long-term deferred revenue	6,773	7,019
Other long-term liabilities	7,500	5,919
Long-term income taxes payable	12,848	12,848
Deferred income taxes	8,169	7,753
Total liabilities	92,642	99,692
Stockholders' equity
Common stock: $.001 par value per share, 75,000 shares authorized; 40,312 and 40,086 issued and outstanding at March 31, 2018 and December 31, 2017, respectively	40	40
Additional paid-in capital	91,106	90,307
Accumulated income	170,319	156,151
Accumulated other comprehensive loss	(7,239)	(8,568)
Total stockholders' equity	254,226	237,930
Total liabilities and stockholders' equity	$ 346,868	$ 337,622

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.