Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows provided by operating activities:
Net income (loss)	$ (59)	$ 1,864
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property and equipment	314	107
Amortization of intangibles	12	20
Stock-based compensation	1,740	1,583
Allowance (recovery) for doubtful accounts	8	0
Changes in operating assets and liabilities:
Accounts and other receivables	1,111	(171)
Deferred income taxes	(138)	1,020
Prepaid expenses and other current assets	248	140
Other operating assets	(10)	(16)
Accounts payable	887	610
Accrued compensation and other current liabilities	1,477	(1,638)
Deferred revenue	15,789	12,947
Other long-term liabilities	119	(27)
Net cash provided by operating activities	21,498	16,439
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(4,994)	(9,988)
Proceeds from maturities of short-term investments	10,000	10,000
Purchases of property and equipment	(783)	(325)
Net cash provided by (used in) investing activities	4,223	(313)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	190	176
Exercise of stock options	64	149
Purchases of treasury stock	0	(6,222)
Net cash provided by (used in) financing activities	254	(5,897)
Net increase (decrease) in cash and cash equivalents	25,975	10,229
Cash and cash equivalents:
Beginning of period	14,380	14,136
End of period	40,355	24,365
Supplemental disclosure of cash flow information
Cash paid for taxes	70	26
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	965	15
Amounts accrued for purchase of treasury stock	0	660
Release of Restricted Stock Units and Awards under company stock plan	$ 2,184	$ 3,061