Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows provided by operating activities:
Net income	$ 3,106	$ 2,752
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	364	459
Amortization of intangibles	55	60
Stock-based compensation	4,058	3,438
Allowance (recovery) for doubtful accounts	3	7
Loss on disposal of equipment	19	12
Changes in operating assets and liabilities:
Accounts and other receivables	(2,397)	1,577
Inventories	0	141
Deferred income taxes	1,539	0
Prepaid expenses and other current assets	(395)	(164)
Other assets	(20)	(58)
Accounts payable	337	281
Accrued compensation and other current liabilities	(3,209)	1,206
Income taxes payable	35	0
Deferred revenue	(336)	5,076
Other long-term liabilities	(77)	(68)
Net cash provided by operating activities	3,082	14,719
Cash flows provided by (used in) investing activities:
Purchases of available-for-sale investments	(37,960)	(71,955)
Proceeds from maturities of available-for-sale investments	42,000	63,000
Purchases of property and equipment	(734)	(174)
Net cash provided by (used in) investing activities	3,306	(9,129)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	381	198
Exercise of stock options	1,229	6,318
Purchases of treasury stock	(11,995)	0
Net cash provided by (used in) financing activities	(10,385)	6,516
Net increase (decrease) in cash and cash equivalents	(3,997)	12,106
Cash and cash equivalents:
Beginning of period	14,136	4,558
End of period	10,139	16,664
Supplemental disclosure of cash flow information
Cash paid for taxes	46	13
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	8	0
Amounts accrued for purchase of treasury stock	3	0
Release of Restricted Stock Units and Awards under company stock plan	$ 3,745	$ 3,183