Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 8,639	$ 12,100
Marketable securities	5,862	5,030
Receivables, net of allowance for doubtful accounts of $187 and $186, as of March 31, 2017 and December 31, 2016 respectively	7,303	7,461
Inventories	14,438	11,377
Distributor channel inventories	1,463	1,530
Prepaid expenses and other assets	3,000	2,642
Total current assets	40,705	40,140
Long-term marketable securities	21,102	21,365
Long-term inventories, net	1,470	1,664
Property and equipment, net	1,529	1,513
Intangibles, net	5,496	5,677
Goodwill	12,724	12,724
Deferred income taxes	4,654	4,654
Other assets	379	387
Total assets	88,059	88,124
Current liabilities:
Accounts payable	4,907	3,545
Accrued liabilities	2,045	1,894
Deferred product revenue	3,888	3,882
Total current liabilities	10,840	9,321
Deferred rent	82	103
Other long-term liabilities	1,274	1,251
Total liabilities	12,196	10,675
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 8,734,917 and 8,812,644 shares issued and outstanding as of March 31, 2017 and December 31, 2016 respectively	9	9
Additional paid-in capital	46,868	46,669
Accumulated other comprehensive loss	(155)	(205)
Retained earnings	29,141	30,976
Total shareholders' equity	75,863	77,449
Total liabilities and shareholders' equity	$ 88,059	$ 88,124

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.