Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 1,864	$ 1,687
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	107	164
Amortization of intangibles	20	20
Stock-based compensation	1,583	1,037
Allowance (recovery) for doubtful accounts	0	16
Changes in operating assets and liabilities:
Accounts and other receivables	(171)	(1,480)
Inventories	0	65
Deferred income taxes	1,020	0
Prepaid expenses and other current assets	140	183
Other assets	(16)	(13)
Accounts payable	610	1,261
Accrued compensation and other current liabilities	(1,638)	1,478
Deferred revenue	12,947	14,565
Other long-term liabilities	(27)	(21)
Net cash provided by operating activities	16,439	18,962
Cash flows provided by (used in) investing activities:
Purchases of available-for-sale investments	(9,988)	(9,996)
Proceeds from maturities of available-for-sale investments	10,000	15,000
Purchases of property and equipment	(325)	(76)
Net cash provided by (used in) investing activities	(313)	4,928
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	176	72
Exercise of stock options	149	1,703
Purchases of treasury stock	(6,222)	0
Net cash provided by (used in) financing activities	(5,897)	1,775
Net increase in cash and cash equivalents	10,229	25,665
Cash and cash equivalents:
Beginning of period	14,136	4,558
End of period	24,365	30,223
Supplemental disclosure of cash flow information
Cash paid for taxes	26	14
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	15	0
Amounts accrued for the purchase of treasury stock	660	0
Release of Restricted Stock Units and Awards under company stock plan	$ 3,061	$ 1,491