Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (5,341)	$ (4,332)
Adjustments to reconcile net loss to cash used in operating activities:
Amortization and accretion of investments	1	26
Depreciation and amortization	240	322
Stock-based compensation expense	378	451
Compensation expense from warrants for services rendered	428
Changes in operating assets and liabilities:
Receivables	83	(239)
Prepaid and other current assets	(262)	(171)
Other assets	(470)	3
Accounts payable	(46)	376
Accrued compensation	389	311
Other liabilities	290	138
Deferred rent	22	(13)
Facility lease exit obligation	(43)	(124)
Net cash used in operating activities	(4,331)	(3,252)
Cash flows from investing activities:
Capital expenditures	(5)	(5)
Purchases of short-term investments	(1,149)
Proceeds from sales and maturities of short-term investments	500	5,200
Net cash provided by (used in) investing activities	(654)	5,195
Cash flows from financing activities:
Proceeds from private placement of common stock, net		3,719
Proceeds from issuance of common stock	60	43
Proceeds from issuance of note payable	8,111
Net cash provided by financing activities	8,171	3,762
Net increase in cash and cash equivalents	3,186	5,705
Cash and cash equivalents at beginning of period	5,295	3,903
Cash and cash equivalents at end of period	$ 8,481	$ 9,608