Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 4,123us-gaap_NetIncomeLoss	$ 40,155us-gaap_NetIncomeLoss	$ (7,197)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	500us-gaap_Depreciation	584us-gaap_Depreciation	654us-gaap_Depreciation
Amortization of intangibles	67us-gaap_AmortizationOfIntangibleAssets	79us-gaap_AmortizationOfIntangibleAssets	49us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	5,295us-gaap_ShareBasedCompensation	4,644us-gaap_ShareBasedCompensation	3,146us-gaap_ShareBasedCompensation
Allowance for doubtful accounts	16us-gaap_ProvisionForDoubtfulAccounts	8us-gaap_ProvisionForDoubtfulAccounts	113us-gaap_ProvisionForDoubtfulAccounts
Loss on disposal of equipment	52	11	27
Gain on sales of discontinued operations	0	0	(153)
Changes in operating assets and liabilities:
Accounts and other receivables	(2,439)	1,272	(504)
Inventories	0us-gaap_IncreaseDecreaseInInventories	141us-gaap_IncreaseDecreaseInInventories	282us-gaap_IncreaseDecreaseInInventories
Deferred income taxes	1,893	(36,850)	0
Prepaid expenses and other current assets	(155)	16	(227)
Other assets	(39)	(152)	(54)
Accounts payable	(10)	341	8
Accrued compensation and other current liabilities	(2,241)	2,788	(717)
Deferred revenue	(6,755)	8,206	(3,194)
Other long-term liabilities	(16)	(91)	374
Net cash provided by (used in) operating activities	291	21,152	(7,393)
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(42,953)	(94,931)	(43,944)
Proceeds from maturities of short-term investments	57,000	77,000	54,000
Additions to intangibles	0	0	(100)
Purchases of property and equipment	(779)	(234)	(1,000)
Proceeds from sales of discontinued operations	0	0	250
Net cash provided by (used in) investing activities	13,268	(18,165)	9,206
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	381	198	122
Exercise of stock options	1,304	6,393	1,046
Purchases of treasury stock	(15,000)	0	(5,721)
Net cash provided by (used in) financing activities	(13,315)	6,591	(4,553)
Net increase (decrease) in cash and cash equivalents	244	9,578	(2,740)
Cash and cash equivalents:
Beginning of year	14,136	4,558	7,298
End of year	14,380	14,136	4,558
Supplemental disclosure of cash flow information:
Cash paid for taxes	47us-gaap_IncomeTaxesPaidNet	18us-gaap_IncomeTaxesPaidNet	21us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of noncash operating, investing, and financing activities:
Amounts accrued for property and equipment	60	24	0
Release of Restricted Stock Units and Awards under company stock plan	$ 3,976us-gaap_StockIssued1	$ 3,482us-gaap_StockIssued1	$ 1,298us-gaap_StockIssued1

The increase (decrease) during the reporting period in the amount of the outstanding money paid in advance for goods and services that bring economic benefits for future periods. This also includes the increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

No definition available.