CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,743	$ 16,242
Marketable investments	73,079	66,831
Accounts receivable, net	6,588	9,679
Inventories	9,640	9,006
Deferred tax asset	31	31
Other current assets and prepaid expenses	2,404	1,507
Total current assets	102,485	103,296
Property and equipment, net	1,358	1,362
Deferred tax asset, net of current portion	337	329
Intangibles, net	1,825	2,019
Goodwill	1,339	1,339
Other long-term assets	21	324
Total assets	107,365	108,669
Current liabilities:
Accounts payable	2,483	1,820
Accrued liabilities	7,805	9,328
Deferred revenue	8,058	7,494
Total current liabilities	18,346	18,642
Deferred revenue, net of current portion	4,324	4,340
Income tax liability	118	108
Other long-term liabilities	1,200	1,314
Total liabilities	23,988	24,404
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: 14,179,834 and 13,931,833 shares at March 31, 2014 and December 31, 2013, respectively	14	14
Additional paid-in capital	101,541	98,820
Accumulated deficit	(18,230)	(14,620)
Accumulated other comprehensive income	52	51
Total stockholders' equity	83,377	84,265
Total liabilities and stockholders' equity	$ 107,365	$ 108,669