CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 17,272	$ 23,546
Marketable investments	70,821	62,026
Accounts receivable, net	6,814	8,841
Inventories	11,091	11,114
Deferred tax asset	39	40
Other current assets and prepaid expenses	1,511	1,439
Total current assets	107,548	107,006
Property and equipment, net	1,312	933
Deferred tax asset, net of current portion	518	553
Intangibles, net	2,392	2,566
Goodwill	1,339	1,339
Other long-term asset	362	397
Total assets	113,471	112,794
Current liabilities:
Accounts payable	2,161	2,107
Accrued liabilities	7,087	9,493
Deferred revenue	6,766	6,618
Total current liabilities	16,014	18,218
Deferred revenue, net of current portion	2,538	2,102
Income tax liability	320	412
Other long-term liabilities	1,449	1,288
Total liabilities	20,321	22,020
Commitments and contingencies (Note 10)
Stockholders' equity:
Convertible preferred stock, $0.001 par value; authorized: 5,000,000 shares; none issued and outstanding	0	0
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 14,671,912 and 14,233,476 shares at March 31, 2013 and December 31, 2012, respectively	14	14
Additional paid-in capital	105,089	100,552
Accumulated deficit	(12,036)	(9,873)
Accumulated other comprehensive income	83	81
Total stockholders' equity	93,150	90,774
Total liabilities and stockholders' equity	$ 113,471	$ 112,794