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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Oct. 31, 2013 | Oct. 31, 2012
Operating activities: |  |
Net loss | $ (4,556) | $ (3,297)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 1,028 | 1,364
Depreciation expense | 102 | 103
Change in fair value of warrant liability | 2,048 | (233)
Changes in operating assets and liabilities: |  |
Accounts receivable | (962) | (43)
Prepaid expenses, deposits and other | 96 | 110
Restricted cash | (1) | 0
Accounts payable | (220) | (467)
Accrued liabilities | (282) | (111)
Deferred revenue | 845 | 20
Net cash used in operating activities | (1,902) | (2,554)
Investing activities: |  |
Purchase of property and equipment | (76) | (28)
Net cash provided by investing activities | (76) | (28)
Financing activities: |  |
Proceeds from exercise of stock options | 9 | 0
Net cash used in financing activities | 9 | 0
Exchange rate effect on cash and cash equivalents | (20) | 27
Decrease in cash and cash equivalents | (1,989) | (2,555)
Cash and cash equivalents, beginning of period | 9,561 | 4,716
Cash and cash equivalents, end of period | $ 7,572 | $ 2,161

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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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. 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 FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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