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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net loss | $ (10,033) | $ (7,159)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 2,101 | 2,957
Depreciation and amortization | 104 | 68
Loss on disposal of property and equipment | 1 |
Changes in operating assets and liabilities: |  |
Accounts receivable | 1,040 | 1,841
Prepaid expenses and other current assets | (458) | (135)
Accounts payable and accrued expenses | (32) | 138
Deferred revenue | 748 | 688
Net cash used in operating activities | (6,529) | (1,602)
Cash flows from investing activities: |  |
Purchase of property and equipment | (136) | (290)
Net cash used in investing activities | (136) | (290)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock, net of offering costs | 6,899 |
Proceeds from exercise of stock options | 524 |
Proceeds from exercise of warrants | 699 | 155
Net cash provided by financing activities | 8,122 | 155
Effect of exchange rate changes on cash | 14 | 43
Net increase (decrease) in cash | 1,471 | (1,694)
Cash at beginning of period | 9,097 | 12,940
Cash at end of period | 10,568 | 11,246
Cash paid during the period for: |  |
Interest paid |  |
Income taxes paid | 95 | 71
Supplemental disclosure of non-cash investing and financing activities: |  |
Cashless exercise of warrants | 3 |
Non Cash Stock subscription receivable | $ 286 |

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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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