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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (9,490) $ (3,351)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss from discontinued operations 134 232
Depreciation and amortization 94 94
Stock-based compensation 1,793 345
Amortization of debt discount 136 25
Changes in operating assets and liabilities:    
Accounts receivable    110
Prepaid expenses and other current assets (291) (192)
Accounts payable (74) 130
Accrued expenses (380) 291
Deferred revenue    (272)
Net cash used in operating activities (8,078) (2,588)
Cash flows from investing activities:    
Purchases of property and equipment (467)   
Net cash used in investing activities (467)   
Cash flows from financing activities:    
Advance proceeds from private placement units   20,300
Proceeds from convertible note financing 3,000 1,500
Proceeds from the issuance of shares under the Employee Stock Purchase Plan 13 10
Net cash provided by financing activities 3,013 21,810
Net increase (decrease) in cash and cash equivalents (5,532) 19,222
Cash and cash equivalents, beginning of period 17,974 2,109
Cash and cash equivalents, end of period $ 12,442 $ 21,331