Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 19,514		$ 24,039
Securities available-for-sale	7,679		6,413
Accounts receivable, net	6,329		6,320
Inventories, net	4,979		6,178
Other current assets	703		855
Restricted cash	244		194
Total current assets	39,448		43,999
Property and equipment, net	4,693		5,367
Intangible assets, net	584	[1]	477	[1]
Goodwill	184		184
Total assets	44,909		50,027
Liabilities and stockholders' equity
Accounts payable	1,546		1,330
Accrued compensation	2,364		2,291
Accrued warranty	326		297
Deferred revenue	1,849		2,099
Other accrued liabilities	2,199		2,397
Total current liabilities	8,284		8,414
Deferred rent	176		126
Total liabilities	8,460		8,540
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.0001 par value: 10,000,000 shares authorized; no shares issued or outstanding	0		0
Common stock, $0.0001 par value: 80,000,000 shares authorized; 19,144,448 and 18,901,160 shares issued and outstanding (net of treasury shares) at December 31, 2012 and 2011, respectively	2		2
Treasury stock, at cost; 1,073,641 and 582,825 shares at December 31, 2012 and 2011, respectively	(2,086)		(1,058)
Additional paid-in capital	156,634		155,704
Accumulated other comprehensive income	17		33
Accumulated deficit	(118,118)		(113,194)
Total stockholders' equity	36,449		41,487
Total liabilities and stockholders' equity	$ 44,909		$ 50,027

[1] Amortization expense for intangible assets, net for the years ended December 31, 2012, 2011 and 2010 was $0.2 million, $0.3 million and $0.4 million, respectively. Estimated amortization expense for intangible assets for 2013 is $0.2 million, for 2014 is $0.1 million, for 2015 is $0.1 million, for 2016 and thereafter less than $0.2 million.