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Common Stock - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2015 | Dec. 01, 2014 | Jan. 28, 2013 | Mar. 24, 2011 | Feb. 28, 2015 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 24, 2015 | Apr. 23, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 |  |  |  |  | $ 0.001 | $ 0.001 |  |
Percentage of share to be purchased by warrant | 0.55% |  |  |  |  |  |  |  |
Exercise price of warrant (in usd per share) | $ 5.76 |  |  |  |  |  |  |  |
Repurchase of stock in put option (in usd per share) | $ 4.80 |  |  |  |  |  |  |  |
Term of warrant |  |  |  |  |  | 5 years |  |  |
Modification of warrant liability |  |  |  |  |  | $ 0 | $ 586,000 |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 200,000,000 | 125,000,000 | 200,000,000 | 125,000,000
Securities Purchase Agreement 2011 [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of share under anti-dilution provisions (in shares) |  |  |  | 188,704 |  |  |  |  |
Additional warrants issued to investors (in shares) |  |  |  | 131,945 |  |  |  |  |
Warrants exercise price per share (in dollars per share) |  |  |  | $ 4.8 |  |  |  |  |
Modification of warrant liability |  |  |  | $ 413,521 |  |  |  |  |
Securities Purchase Agreement 2013 [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Additional warrants issued to investors (in shares) |  |  | 100,750 |  |  |  |  |  |
Warrants exercise price per share (in dollars per share) |  |  | $ 4.8 |  |  |  |  |  |
Modification of warrant liability |  |  | $ 172,344 |  |  |  |  |  |
Securities Purchase Agreement 2015 [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Debt conversion, original amount | $ 100,000 |  |  |  |  |  |  |  |
Debt instrument, increase, accrued interest | $ 60,000 |  |  |  |  |  |  |  |
Debt conversion, converted instrument, discount rate | 5.00% |  |  |  |  |  |  |  |
Convertible Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Debt conversion, original amount |  | $ 1,000,000 |  |  |  |  |  |  |
Short-term debt, percentage bearing fixed interest rate |  | 12.00% |  |  |  |  |  |  |
Short-term debt, terms |  | 90 days |  |  |  |  |  |  |
Term of short-term debt |  | 90 days |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Apr. 01, 2015 |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, increase, accrued interest | $ 60,000 |  |  |  |  |  |  |  |
Debt conversion, converted instrument, discount rate | 5.00% |  |  |  |  |  |  |  |
March 2015 Private Placement [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock and warrants | $ 14,000,000 |  |  |  |  |  |  |  |
Net shares reclassified to mandatory redeemable capital stock, value | 8,000,000 |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | 5,100,000 |  |  |  |  |  |  |  |
Incremental compensation cost | $ 880,000 |  |  |  |  |  |  |  |
Warrants and rights outstanding |  |  |  |  |  | $ 1,600,000 |  |  |

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