CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net loss	$ (2,431)us-gaap_NetIncomeLoss	$ (482)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	93us-gaap_Depreciation	72us-gaap_Depreciation
Amortization of premiums and discounts on investments	141	239
Amortization of intangible assets and other	268us-gaap_AmortizationOfIntangibleAssets	273us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation	711us-gaap_ShareBasedCompensation	622us-gaap_ShareBasedCompensation
Changes in assets and liabilities:
Accounts receivable, net	(748)	1,978
Prepaid expenses and other current assets	13	21
Other long-term assets	(14)	(28)
Accounts payable	(897)	237
Accrued compensation	1,276	1,078
Other accrued liabilities	1,140	(395)
Other long-term liabilities	26	84
Deferred revenue	(43)	(338)
Net cash provided by (used in) operating activities	(465)	3,361
Investing Activities:
Purchases of property and equipment	(160)	(34)
Purchases of investments	(21,700)us-gaap_PaymentsToAcquireInvestments	(15,312)us-gaap_PaymentsToAcquireInvestments
Maturities of investments	15,799	15,108
Net cash used in investing activities	(6,061)	(238)
Financing Activities:
Proceeds from issuances of common stock	0	59
Net cash provided by financing activities	0	59
Effect of exchange rate changes on cash and cash equivalents	(18)	37
Net increase (decrease) in cash and cash equivalents	(6,544)	3,219
Cash and cash equivalents at beginning of period	23,354	28,390
Cash and cash equivalents at end of period	16,810	31,609
Supplemental schedule of cash flow information:
Income taxes paid	$ 77us-gaap_IncomeTaxesPaid	$ 60us-gaap_IncomeTaxesPaid

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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