Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 9,803	$ 16,242
Marketable investments	71,343	66,831
Accounts receivable, net of allowance for doubtful accounts of $0 and $19, respectively	11,137	9,679
Inventories	10,988	9,006
Deferred tax assets	26	31
Other current assets and prepaid expenses	1,591	1,507
Total current assets	104,888	103,296
Property and equipment, net	1,461	1,362
Deferred tax assets, net of current portion	269	329
Intangibles, net	595	2,019
Goodwill	1,339	1,339
Other long-term assets	361	324
Total assets	108,913	108,669
Current liabilities:
Accounts payable	3,083	1,820
Accrued liabilities	11,007	9,328
Deferred revenue	8,898	7,494
Total current liabilities	22,988	18,642
Deferred revenue, net of current portion	4,346	4,340
Income tax liability	145	108
Other long-term liabilities	926	1,314
Total liabilities	28,405	24,404
Commitments and contingencies (Note 11)
Convertible preferred stock, $0.001 par value:
Authorized: 50,000,000 shares; Issued and outstanding: 14,446,950 and 13,931,833 shares at December 31, 2014 and 2013, respectively	14	14
Additional paid-in capital	105,721	98,820
Accumulated deficit	(25,232)	(14,620)
Accumulated other comprehensive income	5	51
Total stockholders’ equity	80,508	84,265
Total liabilities and stockholders’ equity	108,913	108,669
Convertible Preferred Stock [Member]
Convertible preferred stock, $0.001 par value:
Authorized: 5,000,000 shares; Issued and outstanding: none	$ 0	$ 0