CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 11,885	$ 23,546
Marketable investments	77,741	62,026
Accounts receivable, net	7,542	8,841
Inventories	10,518	11,114
Deferred tax asset	39	40
Other current assets and prepaid expenses	1,429	1,439
Total current assets	109,154	107,006
Property and equipment, net	1,338	933
Deferred tax asset, net of current portion	504	553
Intangibles, net	2,218	2,566
Goodwill	1,339	1,339
Other long-term asset	348	397
Total assets	114,901	112,794
Current liabilities:
Accounts payable	2,430	2,107
Accrued liabilities	7,668	9,493
Deferred revenue	6,993	6,618
Total current liabilities	17,091	18,218
Deferred revenue, net of current portion	2,844	2,102
Income tax liability	325	412
Other long-term liabilities	1,386	1,288
Total liabilities	21,646	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: 14,812,366 and 14,233,476 shares at June 30, 2013 and December 31, 2012, respectively	15	14
Additional paid-in capital	105,954	100,552
Accumulated deficit	(12,674)	(9,873)
Accumulated other comprehensive income	(40)	81
Total stockholders' equity	93,255	90,774
Total liabilities and stockholders' equity	$ 114,901	$ 112,794