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Common Stock and Stock Purchase Warrants (Details Textual) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 11, 2015 | Dec. 31, 2015 | Feb. 28, 2015 | Jan. 28, 2013 | Mar. 24, 2011 | Apr. 30, 2015 | Apr. 30, 2014 | Jan. 31, 2016 | Dec. 01, 2014
Stock Issued During Period, Shares, Acquisitions |  |  |  | 1,550,000 | 1,044,444 |  |  |  |
Common Stock Purchase Price |  |  |  | $ 6.00 | $ 9.00 |  |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  |  |  | $ 9,300,000 | $ 9,400,000 |  |  |  |
Issuance of Additional Common Shares to Investors |  |  |  |  |  | 1,468,161 |  |  |
Proceeds from Issuance of Common Stock and Warrants |  |  |  | $ 9,100,000 |  |  |  |  |
Debt Conversion, Original Debt, Amount |  | $ 1,000,000 |  |  |  |  |  |  |
Repurchase Of Stock In Put Option |  |  |  |  |  | $ 4.80 |  |  |
Common Stock, Shares Authorized |  |  |  |  |  | 200,000,000 | 125,000,000 | 200,000,000 |
Warrant Modification Charge |  |  |  |  |  | $ 586,000 | $ 0 |  |
Securities Purchase Agreement 2011 [Member] |  |  |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  | $ 4.80 |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 188,704 |  |  |  |
Additional Warrants Issued To Investors |  |  |  |  | 131,945 |  |  |  |
Warrant Modification Charge |  |  |  |  | $ 413,521 |  |  |  |
Securities Purchase Agreement 2013 [Member] |  |  |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  | $ 4.80 |  |  |  |  |
Additional Warrants Issued To Investors |  |  |  | 100,750 |  |  |  |  |
Warrant Modification Charge |  |  |  | $ 172,344 |  |  |  |  |
Securities Purchase Agreement 2015 [Member] |  |  |  |  |  |  |  |  |
Unit Description | $0.001 per share (the Common Stock) and a warrant to buy 0.55 shares of Common Stock at$5.76 per share (the Warrants), at a purchase price of $4.80 per unit, for an aggregate of $14,000,000. |  |  |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest | $ 60,000 |  |  |  |  |  |  |  |
Debt Conversion Converted Instrument Discount Rate | 5.00% |  |  |  |  |  |  |  |
Convertible Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Short-term Debt, Percentage Bearing Fixed Interest Rate |  |  |  |  |  |  |  |  | 12.00%
Short-term Debt, Terms |  | 90 days |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Apr. 01, 2015 |  |  |  |  |  |
Term Of Warrants |  | 5 years |  |  |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Increase, Accrued Interest | $ 60,000 |  |  |  |  |  |  |  |
Debt Conversion Converted Instrument Discount Rate | 5.00% |  |  |  |  |  |  |  |
January 2013 Private Placement [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures |  |  |  | $ 500,000 |  |  |  |  |
Warrants Issued During Period for Common Stock |  |  |  |  |  | 155,000 |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 7.92 |  |  |
Percentage of Common Stock Purchased |  |  |  |  |  | 25.00% |  |  |
Issuance of Additional Common Shares to Investors |  |  |  |  |  | 88,722 |  |  |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 8,800,000 |  |  |
Proceeds from Issuance of Common Stock and Warrants |  |  |  |  |  | 9,300,000 |  |  |
Proceeds from Issuance of Warrants |  |  |  |  |  | 400,000 |  |  |
Incremental Compensation Cost |  |  |  |  |  | $ 200,000 |  |  |
April 2011 Private Placement [Member] |  |  |  |  |  |  |  |  |
Common Stock Purchase Price |  |  |  |  |  | $ 9.00 |  |  |
Warrants Issued During Period for Common Stock |  |  |  |  |  | 105,556 |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 10.80 |  |  |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 25 |  |  |
Proceeds from Issuance of Warrants |  |  |  |  |  | 900,000 |  |  |
Incremental Compensation Cost |  |  |  |  |  | $ 300,000 |  |  |
April 2011 Private Placement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 6.00 |  |  |
April 2011 Private Placement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Warrants Exercise Price Per Share |  |  |  |  |  | $ 10.80 |  |  |
March 2015 Private Placement [Member] |  |  |  |  |  |  |  |  |
Net Shares Reclassified to Mandatorily Redeemable Capital Stock, Value |  |  |  |  |  | $ 8,000,000 |  |  |
Proceeds from Issuance of Common Stock and Warrants |  |  |  |  |  | 14,000,000 |  |  |
Proceeds from Issuance of Warrants |  |  |  |  |  | 100,000 |  |  |
Incremental Compensation Cost |  |  |  |  |  | 880,000 |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | $ 1,600,000 |  |  |

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