Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 9,545	$ 13,412
Marketable securities	7,141	7,161
Receivables, net of allowance for doubtful accounts of $86 and $54, respectively	9,282	8,692
Inventories	12,668	13,447
Distributor channel inventories	1,669	1,628
Prepaid expenses and other assets	2,104	1,806
Total current assets	42,409	46,146
Long-term marketable securities	20,287	19,204
Long-term inventories, net	2,078	2,018
Property and equipment, net	1,487	1,589
Intangibles, net	6,140	6,638
Goodwill	12,724	12,724
Deferred income taxes	5,093	5,093
Other assets	117	117
Total assets	90,335	93,529
Current liabilities:
Accounts payable	2,097	2,815
Accrued liabilities	2,251	2,243
Deferred product revenue	4,781	4,549
Total current liabilities	9,129	9,607
Deferred rent	140	150
Other long-term liabilities	1,283	1,203
Total liabilities	10,552	10,960
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 8,933,582 and 9,183,957 shares issued and outstanding	9	9
Additional paid-in capital	45,987	46,291
Accumulated other comprehensive income (loss)	64	(166)
Retained earnings	33,723	36,435
Total shareholders' equity	79,783	82,569
Total liabilities and shareholders' equity	$ 90,335	$ 93,529