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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Cash Flows From Operating Activities: |  |
Net loss | $ (4,725) | $ (3,072)
Adjustments to reconcile net loss to net cash used in operating activites: |  |
Stock-based compensation | 864 | 908
Depreciation | 23 | 39
Provision for uncollectible accounts receivable | 0 | 165
Loss on sale of equipment | 58 | 0
Impairment on loss of equipment | 0 | 30
Gain on sale of discontinued operations | 0 | (677)
Changes in operating assets and liabilities: |  |
Accounts receivable | 0 | (5)
Prepaid expenses and other current assets | 629 | (78)
Deposits and other assets | 22 | 11
Accounts payable | (182) | (110)
Accrued liabilities | 16 | 88
Net Cash Used In Operating Activities | (3,295) | (2,701)
Cash Flows From Investing Activities: |  |
Purchase of property and equipment | (13) | 0
Net Cash Used In Investing Activities | (13) | 0
Cash Flows From Financing Activities: |  |
Proceeds from issuance of common stock for stock option exercises | 231 | 94
Proceeds from issuance of common stock for warrant exercises | 0 | 1,861
Net Cash Provided By Financing Activities | 231 | 1,955
Net increase(decrease) in cash | (3,077) | (746)
Cash at beginning of period | 9,954 | 6,678
Cash at end of period | 6,877 | 5,932
Supplemental disclosures of cash flow information: |  |
Cash paid for interest | 0 | 0
Cash paid for taxes | $ 0 | $ 0

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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