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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Mar. 11, 2015 | Nov. 30, 2014 | Apr. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated fair value of warrants |  |  | $ 1,600,000 |  |
Allowance for doubtful accounts receivable | $ 32,000 | $ 2,000 |  |  |
Unbilled receivables, current | 617,000 | 636,000 |  |  |
Restricted cash | 150,000 | 163,000 |  |  |
Depreciation and amortization | 156,000 | 214,000 |  |  |
Capital lease asset | 124,000 | 124,000 |  |  |
Capital leases, income statement, amortization expense | $ 24,818 | 12,405 |  |  |
Capital leases, future minimum payments, executory costs |  |  |  | $ 149,000 |
Capital leases monthly payments |  |  |  | $ 3,000 |
Capital leases of lessee, contingent rentals, basis spread on variable rate | 5.00% |  |  |  |
Deferred revenue | $ 67,000 | 258,000 |  |  |
Unrecognized tax benefits | $ 165,000 | $ 100,000 |  |  | $ 0
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life | 7 years |  |  |  |

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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