CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:
Net income (loss)	$ 10,383	$ (5,424)	$ (18,640)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense	3,481	4,525	3,769
Amortization of intangible assets and other	1,321	1,522	866
Warrant-related charges	777	0	0
Amortization of premiums and discounts on investments	646	588	1,451
Depreciation	351	503	438
Amortization of purchased technology	62	81	83
Utilized excess tax benefit	34	0	0
Loss on cumulative translation adjustment on discontinued operations	0	0	284
Realized gain on investments	0	0	(7)
Changes in assets and liabilities:
Accounts receivable, net	(4,304)	747	(5,146)
Prepaid expenses and other current assets	32	(342)	544
Other assets	76	(460)	(192)
Accounts payable	414	(752)	658
Accrued compensation	539	(67)	402
Other accrued liabilities	(623)	(527)	885
Other long-term liabilities	316	201	340
Deferred revenue	(3,295)	1,357	3,147
Net cash provided by (used in) operating activities	10,210	1,952	(11,118)
Investing activities:
Purchases of property and equipment	(221)	(523)	(279)
Acquisition of business, net of cash acquired	0	(1,327)	(8,419)
Purchases of investments	(61,779)	(37,764)	(50,763)
Sales of investments	104	2,400	23,263
Maturities of investments	42,544	40,445	50,691
Net cash (used in) provided by investing activities	(19,352)	3,231	14,493
Financing activities:
Proceeds from issuance of common stock	11,045	3,530	516
Repurchase of common stock	(4,114)	0	0
Net cash provided by financing activities	6,931	3,530	516
Net (decrease) increase in cash and cash equivalents	(2,211)	8,713	3,891
Effect of exchange rate changes on cash and cash equivalents	(251)	(20)	(293)
Cash and cash equivalents at beginning of period	30,852	22,159	18,561
Cash and cash equivalents at end of period	28,390	30,852	22,159
Supplemental schedule of cash flow information:
Cash paid for (refund of) income taxes	$ 120	$ 86	$ (89)