Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 12,273	$ 13,412
Marketable securities	7,060	7,161
Receivables, net of allowance for doubtful accounts of $49 and $54, respectively	8,483	8,692
Inventories, net	11,991	13,447
Distributor channel inventories	1,538	1,628
Prepaid expenses and other assets	2,216	1,806
Total current assets	43,561	46,146
Long-term marketable securities	20,721	19,204
Long-term inventories, net	1,753	2,018
Property and equipment, net	1,409	1,589
Intangibles, net	5,902	6,638
Goodwill	12,724	12,724
Deferred income taxes	5,093	5,093
Other assets	117	117
Total assets	91,280	93,529
Current liabilities:
Accounts payable	3,587	2,815
Accrued liabilities	2,085	2,243
Deferred product revenue	4,271	4,549
Total current liabilities	9,943	9,607
Deferred rent	122	150
Other long-term liabilities	1,260	1,203
Total liabilities	11,325	10,960
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 8,892,042 and 9,183,957 shares issued and outstanding	9	9
Additional paid-in capital	46,455	46,291
Accumulated other comprehensive income (loss)	32	(166)
Retained earnings	33,459	36,435
Total shareholders' equity	79,955	82,569
Total liabilities and shareholders' equity	$ 91,280	$ 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.