Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Convertible Preferred Stock [Member]
Stockholders’ equity:
Convertible preferred stock, $0.001 par value; authorized: 5,000,000 shares; none issued and outstanding
Cash and cash equivalents	$ 10,055	$ 9,803
Marketable investments	37,689	71,343
Accounts receivable, net	9,013	11,137
Inventories	13,479	10,988
Deferred tax asset	69	26
Other current assets and prepaid expenses	1,977	1,591
Total current assets	72,282	104,888
Property and equipment, net	1,386	1,461
Deferred tax asset, net of current portion	291	269
Intangibles, net	227	595
Goodwill	1,339	1,339
Other long-term assets	392	361
Total assets	75,917	108,913
Accounts payable	2,659	3,083
Accrued liabilities	12,234	11,007
Deferred revenue	8,470	8,898
Total current liabilities	23,363	22,988
Deferred revenue, net of current portion	2,495	4,346
Income tax liability	187	145
Other long-term liabilities	538	926
Total liabilities	26,583	28,405
Common stock, $0.001 par value; authorized: 50,000,000 shares; issued and outstanding: 13,136,245 and 14,446,950 shares at September 30, 2015 and December 31, 2014, respectively	13	14
Additional paid-in capital	81,043	105,721
Accumulated deficit	$ (31,722)	(25,232)
Accumulated other comprehensive income		5
Total stockholders’ equity	$ 49,334	80,508
Total liabilities and stockholders’ equity	$ 75,917	$ 108,913