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Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net loss $ (11,814) $ (7,346) $ (10,028)
Adjustments to reconcile net loss to net cash used in operating activities:      
Loss (gain) from discontinued operations 379 150 (68)
Depreciation and amortization 179 227 356
Amortization of debt discount 103      
Stock-based compensation 1,890 1,749 1,137
Stock issued in lieu of bonus       36
Loss on retirement of fixed assets    4 17
Changes in operating assets and liabilities:      
Accounts receivable 110 61 (139)
Prepaid expenses and other current assets 16 267 (303)
Other long-term assets (77) 75 (25)
Accounts payable 467 (3) (182)
Accrued expenses 1,298 (579) (1,160)
Deferred revenue (272) (88) (640)
Net cash used in continuing operating activities (7,721) (5,483) (10,999)
Net cash provided by discontinued operations         
Net cash used in operating activities (7,721) (5,483) (10,999)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (513) (78) (2)
Maturities of marketable securities       614
Net cash provided by (used in) investing activities (513) (78) 612
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from sale of units of common stock and warrants, net of issuance costs 22,772    7,951
Proceeds from convertible note financing, net of issuance costs 1,312      
Proceeds from the exercise of stock options    47 20
Proceeds from the issuance of shares under the Employee Stock Purchase Plan 15 30 42
Net cash provided by financing activities 24,099 77 8,013
Net increase (decrease) in cash and cash equivalents 15,865 (5,484) (2,374)
Cash and cash equivalents, beginning of period 2,109 7,593 9,967
Cash and cash equivalents, end of period 17,974 2,109 7,593
Supplemental Cash Flow Data:      
Cash paid for interest $ 2 $ 4 $ 4