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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash Flows From Operating Activities:    
Net Loss $ (8,394) $ (4,725)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,217 864
Depreciation 7 23
Loss on sale of equipment 0 58
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 202 629
Deposits and other assets (2) 22
Accounts payable 937 (182)
Accrued liabilities (732) 16
Net Cash Used In Operating Activities (6,765) (3,295)
Cash Flows From Investing Activities:    
Purchases of property and equipment (21) (13)
Net Cash Used In Investing Activities (21) (13)
Cash Flows From Financing Activities:    
Proceeds from issuance of common stock for stock option exercises 4 231
Net Cash Provided By Financing Activities 4 231
Net decrease in cash (6,782) (3,077)
Cash at beginning of period 14,625 9,954
Cash at end of period 7,843 6,877
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for taxes $ 0 $ 0