Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 10,865	$ 7,440
Marketable securities	7,314	6,994
Receivables, net of allowance for doubtful accounts of $79 and $58, respectively	8,593	9,916
Inventories	13,869	12,766
Distributor channel inventories	1,540	1,698
Deferred income taxes	3,824	3,824
Prepaid expenses and other assets	1,267	2,143
Total current assets	47,272	44,781
Long-term marketable securities	18,133	19,162
Long-term inventories, net	690	876
Property and equipment, net	1,901	2,039
Intangibles, net	7,581	7,896
Goodwill	12,724	12,724
Deferred income taxes	1,265	1,265
Other assets	115	117
Total assets	89,681	88,860
Current liabilities:
Accounts payable	3,854	3,057
Accrued liabilities	2,508	2,694
Deferred product revenue	4,684	5,004
Total current liabilities	11,046	10,755
Deferred rent	222	248
Other long-term liabilities	1,304	1,841
Total liabilities	12,572	12,844
Shareholders' equity:
Common stock, par value $0.001, 50,000,000 shares authorized, 9,111,790 and 9,097,827 shares issued and outstanding	9	9
Additional paid-in capital	45,204	44,939
Accumulated other comprehensive (loss)	(133)	(8)
Retained earnings	32,029	31,076
Total shareholders' equity	77,109	76,016
Total liabilities and shareholders' equity	$ 89,681	$ 88,860