Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows provided by operating activities:
Net income	$ 2,033	$ 2,153
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	234	313
Amortization of intangibles	40	40
Stock-based compensation	2,927	2,189
Allowance (recovery) for doubtful accounts	14	24
Loss on disposal of equipment	19	12
Changes in operating assets and liabilities:
Accounts and other receivables	(764)	981
Inventories	0	100
Deferred income taxes	1,035	0
Prepaid expenses and other current assets	(404)	(239)
Other assets	(37)	(41)
Accounts payable	676	261
Accrued compensation and other current liabilities	(2,153)	(34)
Deferred revenue	6,121	8,652
Other long-term liabilities	(52)	(46)
Net cash provided by operating activities	9,689	14,365
Cash flows used in investing activities:
Purchases of available-for-sale investments	(28,969)	(52,971)
Proceeds from maturities of available-for-sale investments	29,000	35,000
Purchases of property and equipment	(666)	(159)
Net cash used in investing activities	(635)	(18,130)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	176	72
Exercise of stock options	842	6,039
Purchases of treasury stock	(6,991)	0
Net cash provided by (used in) financing activities	(5,973)	6,111
Net increase in cash and cash equivalents	3,081	2,346
Cash and cash equivalents:
Beginning of period	14,136	4,558
End of period	17,217	6,904
Supplemental disclosure of cash flow information
Cash paid for taxes	25	5
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	30	3
Release of Restricted Stock Units and Awards under company stock plan	$ 3,588	$ 2,942