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Share-Based Payments (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Apr. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] | Stock-based compensation expense was recognized as follows (table in thousands):
|  | Three Months Ended January 31, |  | Nine Months Ended January 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
General and administrative |  | $ | 488 |  |  | $ | 474 |  |  | $ | 1,600 |  |  | $ | 1,530 |
Sales and marketing |  |  | 27 |  |  |  | 114 |  |  |  | 173 |  |  |  | 447 |
Research and development |  |  | 49 |  |  |  | 65 |  |  |  | 262 |  |  |  | 267 |
TOS cost of sales |  |  | 2 |  |  |  | 2 |  |  |  | 28 |  |  |  | 20 |
POS cost of sales |  |  | 1 |  |  |  | 2 |  |  |  | 27 |  |  |  | 20 |
Total stock-based compensation expense |  | $ | 567 |  |  | $ | 657 |  |  | $ | 2,090 |  |  | $ | 2,284 |
| Stock-based compensation costs were recorded as follows (in thousands):
|  | Year Ended April 30,
|  | 2015 |  | 2014
General and administrative |  | $ | 2,204 |  |  | $ | 2,298 |
Sales and marketing |  |  | 561 |  |  |  | 352 |
Research and development |  |  | 352 |  |  |  | 36 |
TOS cost of sales |  |  | 23 |  |  |  | 56 |
POS cost of sales |  |  | 22 |  |  |  | 65 |
Total stock-based compensation expense |  | $ | 3,162 |  |  | $ | 2,807 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | ### Black-Scholes assumptions used to calculate the fair value of options granted during the three and nine months ended January 31, 2016 and 2015 were as follows:
|  | Three Months Ended January 31, |  | Nine Months Ended January 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Expected term in years |  |  | 2.5 – 6 |  |  |  | — |  |  |  | 2.5 – 6 |  |  |  | 3 – 6 |
Risk-free interest rates |  |  | 0.995% – 1.75% |  |  |  | — |  |  |  | 0.995% – 1.77% |  |  |  | 0.79% – 1.94% |
Volatility |  |  | 82.72% – 91.98% |  |  |  | — |  |  |  | 82.72% – 92.32% |  |  |  | 85.8% – 102.1% |
Dividend yield |  |  | 0% |  |  |  | — |  |  |  | 0% |  |  |  | 0% |
| ### Black-Scholes assumptions used to calculate the fair value of options granted during the years ended April 30, 2015 and 2014 were as follows:
|  | Year Ended April 30,
|  | 2015 |  | 2014
Expected term in years |  |  | 2.5 – 6.0 |  |  |  | 3.0 – 6.0 |
Risk-free interest rates |  |  | 0.8% – 1.9% |  |  |  | 0.7% – 2.4% |
Volatility |  |  | 86% – 102% |  |  |  | 84% – 102% |
Dividend yield |  |  | 0% |  |  |  | 0% |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The Company’s stock options activity for the nine months ended January 31, 2016 was as follows:
|  | Non- Employees |  | Directors and Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2015 |  |  | 57,917 |  |  |  | 1,946,085 |  |  |  | 2,004,002 |  |  | $ | 5.74 |  |  |  | 6.7 |  |  | $ | 4,166,000 |
Granted |  |  | — |  |  |  | 331,582 |  |  |  | 331,582 |  |  |  | 5.33 |  |  |  | 8.9 |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | (38,140 | ) |  |  | (38,140 | ) |  |  | 6.64 |  |  |  |  |  |  |  |  |
Expired |  |  | (6,667 | ) |  |  | (78,206 | ) |  |  | (84,873 | ) |  |  | 6.91 |  |  |  |  |  |  |  |  |
Outstanding, January 31, 2016 |  |  | 51,250 |  |  |  | 2,161,321 |  |  |  | 2,212,571 |  |  |  | 5.61 |  |  |  | 6.4 |  |  | $ | 1,000 |
Vested and expected to vest as of January 31, 2016 |  |  | 51,250 |  |  |  | 2,161,321 |  |  |  | 2,212,571 |  |  |  | 5.61 |  |  |  | 6.4 |  |  | $ | 1,000 |
Exercisable as of January 31, 2016 |  |  | 34,271 |  |  |  | 1,644,223 |  |  |  | 1,678,494 |  |  |  | 5.76 |  |  |  | 5.8 |  |  | $ | 1,000 |
| The Company’s stock options activity and related information as of and for the years ended April 30, 2015 and 2014 is as follows (dollars in thousands):
|  | Non- Employees |  | Directors and Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2014 |  |  | 63,750 |  |  |  | 1,882,170 |  |  |  | 1,945,920 |  |  | $ | 12.12 |  |  |  | 7.5 |  |  | $ | 985,000 |
Granted |  |  | 6,667 |  |  |  | 1,756,714 |  |  |  | 1,763,380 |  |  |  | 7.92 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | (313 | ) |  |  | (313 | ) |  |  | 5.88 |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  |  | (1,656,073 | ) |  |  | (1,656,073 | ) |  |  | 12.48 |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | (12,604 | ) |  |  | (12,604 | ) |  |  | 11.52 |  |  |  |  |  |  |  |  |
Expired |  |  | (12,500 | ) |  |  | (23,809 | ) |  |  | (36,309 | ) |  |  | 11.88 |  |  |  |  |  |  |  |  |
Outstanding, April 30, 2015 |  |  | 57,917 |  |  |  | 1,946,085 |  |  |  | 2,004,002 |  |  |  | 5.74 |  |  |  | 6.7 |  |  | $ | 4,166,000 |
Vested and expected to vest as of April 30, 2015 |  |  | 57,917 |  |  |  | 1,946,085 |  |  |  | 2,004,002 |  |  |  |  |  |  |  | 6.7 |  |  | $ | 4,166,000 |
Vested as of April 30, 2015 |  |  | 40,625 |  |  |  | 1,385,298 |  |  |  | 1,425,923 |  |  |  | 5.88 |  |  |  | 5.9 |  |  | $ | 2,879,000 |
|  | Non- Employees |  | Directors and Employees |  | Total |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2013 |  |  | 63,750 |  |  |  | 1,093,767 |  |  |  | 1,157,517 |  |  | $ | 10.20 |  |  |  | 7.0 |  |  | $ | 89,000 |
Granted |  |  | — |  |  |  | 816,111 |  |  |  | 816,111 |  |  |  | 14.76 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | (2,813 | ) |  |  | (2,813 | ) |  |  | 7.56 |  |  |  |  |  |  |  |  |
Canceled |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited |  |  | — |  |  |  | (6,042 | ) |  |  | (6,042 | ) |  |  | 9.84 |  |  |  |  |  |  |  |  |
Expired |  |  | — |  |  |  | (18,854 | ) |  |  | (18,854 | ) |  |  | 8.76 |  |  |  |  |  |  |  |  |
Outstanding, April 30, 2014 |  |  | 63,750 |  |  |  | 1,882,170 |  |  |  | 1,945,920 |  |  |  | 12.12 |  |  |  | 7.5 |  |  | $ | 985,000 |
Vested and expected to vest as of April 30, 2014 |  |  | 63,750 |  |  |  | 1,882,170 |  |  |  | 1,945,920 |  |  |  |  |  |  |  | 7.5 |  |  | $ | 985,000 |
Vested as of April 30, 2014 |  |  | 43,524 |  |  |  | 1,086,857 |  |  |  | 1,130,381 |  |  |  | 10.20 |  |  |  | 6.1 |  |  | $ | 927,000 |
Schedule Of Share Based Compensation Warrants Activity [Table Text Block] | Activity related to these warrants, which expire at various dates through January 2019, is summarized as follows:
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2015 |  |  | 2,109,840 |  |  | $ | 5.54 |  |  |  | 4.6 |  |  | $ | 3,764,871 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, January 31, 2016 |  |  | 2,109,840 |  |  | $ | 5.54 |  |  |  | 3.9 |  |  | $ | — |
| Activity related to these warrants, which expire at various dates through January 2019, is summarized as follows (dollars in thousands):
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2014 |  |  | 273,056 |  |  | $ | 7.32 |  |  |  | 2.9 |  |  | $ | 984,333 |
Granted |  |  | 1,849,285 |  |  |  | 5.64 |  |  |  | 4.9 |  |  |  | 3,108,271 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | (12,500 | ) |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, April 30, 2015 |  |  | 2,109,840 |  |  | $ | 5.82 |  |  |  | 4.6 |  |  | $ | 3,247,604 |
|  | Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding, May 1, 2013 |  |  | 273,056 |  |  | $ | 7.32 |  |  |  | 3.9 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Outstanding, April 30, 2014 |  |  | 273,056 |  |  | $ | 7.32 |  |  |  | 2.9 |  |  | $ | 984,333 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for warrants that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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