Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 12,100	$ 13,412
Marketable securities	5,030	7,161
Receivables, net of allowance for doubtful accounts of $187 and $54, as of December 31, 2016 and 2015 respectively	7,461	8,692
Inventories	11,377	13,447
Distributor channel inventories	1,530	1,628
Prepaid expenses and other assets	2,642	1,806
Total current assets	40,140	46,146
Long-term marketable securities	21,365	19,204
Long-term inventories, net	1,664	2,018
Property and equipment, net	1,513	1,589
Intangibles, net	5,677	6,638
Goodwill	12,724	12,724
Deferred income taxes	4,654	5,093
Other assets	387	117
Total assets	88,124	93,529
Current liabilities:
Accounts payable	3,545	2,815
Accrued liabilities	1,894	2,243
Deferred product revenue	3,882	4,549
Total current liabilities	9,321	9,607
Deferred rent	103	150
Other long-term liabilities	1,251	1,203
Total liabilities	10,675	10,960
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 8,812,644 and 9,183,957 shares issued and outstanding as of December 31, 2016 and 2015 respectively	9	9
Additional paid-in capital	46,669	46,291
Accumulated other comprehensive loss	(205)	(166)
Retained earnings	30,976	36,435
Total shareholders' equity	77,449	82,569
Total liabilities and shareholders' equity	$ 88,124	$ 93,529

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.