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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015
Operating activities: |  |
Net loss | $ (10,445,537) | $ (13,139,820)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation and modification expense | 2,599,000 | 3,162,000
Depreciation and amortization expense | 156,000 | 214,000
Change in fair value of warrant liability | 0 | (981,000)
Modification of warrant liability | 0 | 586,000
Gain/loss on sales of assets | 0 | 5,000
Allowance for doubtful accounts | 30,000 | 0
Changes in operating assets and liabilities: |  |
Accounts receivable | (282,000) | 265,000
Prepaid expenses, deposits and other | (97,000) | 37,000
Restricted cash | 13,000 | 2,000
Accounts payable | 482,000 | 433,000
Accrued liabilities | (102,000) | (231,000)
Other Non-current liability | 65,000 | 100,000
Deferred revenue | 1,130,000 | (82,000)
Net cash used in operating activities | (6,452,000) | (9,630,000)
Investing activities: |  |
Purchase of property and equipment | (322,000) | (119,000)
Proceeds from sale of fixed assets | 0 | 5,000
Net cash used in investing activities | (322,000) | (114,000)
Financing activities: |  |
Private placement financing, net of financing costs of $880k | 0 | 11,220,000
Proceeds from Executive Note financing | 0 | 2,000,000
Payment of issuance costs related to 2015 Private Placement | (18,000) | 0
Capital lease payments | (24,000) | (12,000)
Issuance of common stock | 44,000 | 0
Proceeds from exercise of options and warrants | 0 | 2,000
Net cash provided by financing activities | 2,000 | 13,210,000
Increase (decrease) in cash and cash equivalents | (6,772,000) | 3,466,000
Cash and cash equivalents, beginning of year | 9,357,000 | 5,891,000
Cash and cash equivalents, end of year | 2,585,000 | 9,357,000
Non-cash investing and financing activities: |  |
Purchased equipment under capital lease | 0 | 124,000
Conversion of executive note financing | 0 | 2,000,000
Reclassification of warrant liability to equity | $ 0 | $ 1,616,000

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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration