Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 15,594	$ 17,559
Short-term investment securities	36,407	33,596
Accounts receivable, net of allowance for doubtful accounts of $232 and $222 at March 31, 2013 and December 31, 2012 , respectively	17,843	18,586
Inventories, net	16,848	17,573
Deferred tax assets, net	1,484	1,484
Prepaid expenses and other assets	1,220	2,160
Total current assets	89,396	90,958
Property and equipment, net	14,702	14,777
Goodwill	161	161
Intangible assets, net	6,399	7,004
Deferred tax assets, net	13,000	14,034
Other noncurrent assets	1,729	1,636
TOTAL ASSETS	125,387	128,570
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	7,142	10,643
Accrued liabilities	6,019	5,916
Total current liabilities	13,161	16,559
Contingent consideration	0	1,130
Other long-term liabilities	2,782	2,736
Total long-term liabilities	2,782	3,866
Total liabilities	15,943	20,425
Stockholders' equity:
Common stock, $0.001 par value, 100,000,000 shares authorized, 18 ,463,886 and 18,514,809 shares issued and outstanding at March 31, 2013 and December 31, 2012 respectively	18	19
Additional paid-in capital	140,477	140,388
Accumulated deficit	(31,194)	(32,410)
Accumulated other comprehensive income	143	148
Total equity	109,444	108,145
TOTAL LIABILITIES AND EQUITY	$ 125,387	$ 128,570