Subsequent Events	3 Months Ended
Oct. 31, 2011
Subsequent Events [Abstract]
Subsequent Events	10. Subsequent Events At the Market Offerings and Termination of Sales Agreement From November 1, 2011 through December 13, 2011, we sold 373,544 shares of our common stock in at the market offerings pursuant to our sales agreement with an investment banking firm as detailed further in Note 7 above. Net proceeds from the sale of these shares were $228,000. Effective as of December 14, 2011, we terminated the sales agreement pursuant to which such at the market offerings were made. As a result of such termination, there will be no future sales of our common stock under the sales agreement. As of December 13, 2011, we had $2,674,340 remaining on our shelf registration statement. Agreements with Lincoln Park; Engagement Letter with Wharton Capital Markets On December 14, 2011, we entered into a purchase agreement, or the $7.5M Purchase Agreement, and a registration rights agreement, or the Registration Rights Agreement, with Lincoln Park Capital Fund, LLC, or Lincoln Park, pursuant to which Lincoln Park has agreed to purchase from us up to $7,500,000 in shares of our common stock from time to time over the 36-month period commencing on the date of the effectiveness of a registration statement for the resale of such shares that we must file with the SEC pursuant to the Registration Rights Agreement. We do not have the right to commence any sales to Lincoln Park under the $7.5M Purchase Agreement until the SEC has declared effective the resale registration statement, but after such registration statement is declared effective, we may direct Lincoln Park, from time to time and at our sole discretion (subject to the terms and conditions thereof), to purchase shares of our common stock at a purchase price per share based on the prevailing market prices of our common stock immediately preceding each notice of sale to Lincoln Park. There is no upper limit on the price per share that Lincoln Park could be obligated to pay for our common stock under the $7.5M Purchase Agreement, but in no event will such shares be sold to Lincoln Park at a price of less than $0.25 per share. As consideration for its commitment to purchase shares of our common stock pursuant to the $7.5M Purchase Agreement, we have issued to Lincoln Park 470,711 shares of our common stock at no cost to Lincoln Park. Such shares will be registered for resale pursuant to the registration statement that we must file pursuant to the $7.5M Purchase Agreement and the Registration Rights Agreement. On December 15, 2011, we entered into an additional purchase agreement, or the $2.5M Purchase Agreement, with Lincoln Park, pursuant to which Lincoln Park has agreed to purchase from us up to $2,500,000 in shares of our common stock. Under the terms of the $2.5M Purchase Agreement, Lincoln Park will initially purchase 1,347,709 shares of our common stock at a price per share of $0.371 for an aggregate amount of $500,000. Thereafter, we may, from time to time and at our sole discretion (subject to the terms and conditions thereof) over a 36-month period, direct Lincoln Park, to purchase shares of our common stock at a purchase price per share based on the prevailing market prices of our common stock immediately preceding each notice of sale to Lincoln Park. The shares sold to Lincoln Park pursuant to the $2.5M Purchase Agreement will be made pursuant to our effective shelf registration statement previously filed with the SEC, as supplemented by our registration statement on Form S-3MEF. As with the $7.5M Purchase Agreement, there is no upper limit on the price per share that Lincoln Park could be obligated to pay for our common stock under the $2.5M Purchase Agreement, but in no event will such shares be sold to Lincoln Park at a price of less than $0.25 per share. As consideration for its commitment to purchase shares of our common stock under to the $2.5M Purchase Agreement, we have issued to Lincoln Park an additional 156,904 shares of our common stock at no cost to Lincoln Park. In connection with the sale of our common stock to Lincoln Park pursuant to the $2.5M Purchase Agreement and the $7.5M Purchase Agreement, subject to our receipt of written confirmation that the Corporate Finance Department of the Financial Industry Regulatory Authority, Inc., or FINRA, has determined not to raise any objection with respect to the fairness or reasonableness of the compensation terms of our arrangement with Wharton, we have agreed to pay a cash fee to Wharton Capital Markets LLC, or Wharton, pursuant to an engagement letter with Wharton dated December 8, 2011, or the Engagement Letter, in an amount equal to 6% of the aggregate gross proceeds to us from the issuance and sale of shares to be offered pursuant to our agreements with Lincoln Park. Such amounts will become due and payable to Wharton at the time that we actually receive funds from Lincoln Park pursuant to such agreements, provided that we have received such written confirmation of no objections from FINRA. Additionally, only upon our receipt of such written confirmation of no objections from FINRA, we have agreed to issue to Wharton or its designee a warrant to purchase 200,000 shares of our common stock with an exercise price of 110% of the closing sale price of our common stock on the date of the issuance of such warrant. Neither the warrant to be issued to Wharton nor the shares to be issued thereunder are to be registered for sale or resale under the Securities Act and will be issued in reliance on an exemption from registration under the Securities Act pursuant to Section 4(2) thereof. The matters described in this Note 10 are described in more detail in our Current Report on Form 8-K, which we filed with the SEC on December 15, 2011. In addition, the $2.5M Purchase Agreement, the $7.5M Purchase Agreement, the Registration Rights Agreement and the Engagement Letter are each filed as exhibits to this Quarterly Report on Form 10‑Q.

10. Subsequent Events

At the Market Offerings and Termination of Sales Agreement

From November 1, 2011 through December 13, 2011, we sold 373,544 shares of our common stock in at the market offerings pursuant to our sales agreement with an investment banking firm as detailed further in Note 7 above. Net proceeds from the sale of these shares were $228,000. Effective as of December 14, 2011, we terminated the sales agreement pursuant to which such at the market offerings were made. As a result of such termination, there will be no future sales of our common stock under the sales agreement. As of December 13, 2011, we had $2,674,340 remaining on our shelf registration statement.

Agreements with Lincoln Park; Engagement Letter with Wharton Capital Markets

On December 14, 2011, we entered into a purchase agreement, or the $7.5M Purchase Agreement, and a registration rights agreement, or the Registration Rights Agreement, with Lincoln Park Capital Fund, LLC, or Lincoln Park, pursuant to which Lincoln Park has agreed to purchase from us up to $7,500,000 in shares of our common stock from time to time over the 36-month period commencing on the date of the effectiveness of a registration statement for the resale of such shares that we must file with the SEC pursuant to the Registration Rights Agreement. We do not have the right to commence any sales to Lincoln Park under the $7.5M Purchase Agreement until the SEC has declared effective the resale registration statement, but after such registration statement is declared effective, we may direct Lincoln Park, from time to time and at our sole discretion (subject to the terms and conditions thereof), to purchase shares of our common stock at a purchase price per share based on the prevailing market prices of our common stock immediately preceding each notice of sale to Lincoln Park. There is no upper limit on the price per share that Lincoln Park could be obligated to pay for our common stock under the $7.5M Purchase Agreement, but in no event will such shares be sold to Lincoln Park at a price of less than $0.25 per share. As consideration for its commitment to purchase shares of our common stock pursuant to the $7.5M Purchase Agreement, we have issued to Lincoln Park 470,711 shares of our common stock at no cost to Lincoln Park. Such shares will be registered for resale pursuant to the registration statement that we must file pursuant to the $7.5M Purchase Agreement and the Registration Rights Agreement.

On December 15, 2011, we entered into an additional purchase agreement, or the $2.5M Purchase Agreement, with Lincoln Park, pursuant to which Lincoln Park has agreed to purchase from us up to $2,500,000 in shares of our common stock. Under the terms of the $2.5M Purchase Agreement, Lincoln Park will initially purchase 1,347,709 shares of our common stock at a price per share of $0.371 for an aggregate amount of $500,000. Thereafter, we may, from time to time and at our sole discretion (subject to the terms and conditions thereof) over a 36-month period, direct Lincoln Park, to purchase shares of our common stock at a purchase price per share based on the prevailing market prices of our common stock immediately preceding each notice of sale to Lincoln Park. The shares sold to Lincoln Park pursuant to the $2.5M Purchase Agreement will be made pursuant to our effective shelf registration statement previously filed with the SEC, as supplemented by our registration statement on Form S-3MEF. As with the $7.5M Purchase Agreement, there is no upper limit on the price per share that Lincoln Park could be obligated to pay for our common stock under the $2.5M Purchase Agreement, but in no event will such shares be sold to Lincoln Park at a price of less than $0.25 per share. As consideration for its commitment to purchase shares of our common stock under to the $2.5M Purchase Agreement, we have issued to Lincoln Park an additional 156,904 shares of our common stock at no cost to Lincoln Park.

In connection with the sale of our common stock to Lincoln Park pursuant to the $2.5M Purchase Agreement and the $7.5M Purchase Agreement, subject to our receipt of written confirmation that the Corporate Finance Department of the Financial Industry Regulatory Authority, Inc., or FINRA, has determined not to raise any objection with respect to the fairness or reasonableness of the compensation terms of our arrangement with Wharton, we have agreed to pay a cash fee to Wharton Capital Markets LLC, or Wharton, pursuant to an engagement letter with Wharton dated December 8, 2011, or the Engagement Letter, in an amount equal to 6% of the aggregate gross proceeds to us from the issuance and sale of shares to be offered pursuant to our agreements with Lincoln Park. Such amounts will become due and payable to Wharton at the time that we actually receive funds from Lincoln Park pursuant to such agreements, provided that we have received such written confirmation of no objections from FINRA. Additionally, only upon our receipt of such written confirmation of no objections from FINRA, we have agreed to issue to Wharton or its designee a warrant to purchase 200,000 shares of our common stock with an exercise price of 110% of the closing sale price of our common stock on the date of the issuance of such warrant. Neither the warrant to be issued to Wharton nor the shares to be issued thereunder are to be registered for sale or resale under the Securities Act and will be issued in reliance on an exemption from registration under the Securities Act pursuant to Section 4(2) thereof.

The matters described in this Note 10 are described in more detail in our Current Report on Form 8-K, which we filed with the SEC on December 15, 2011. In addition, the $2.5M Purchase Agreement, the $7.5M Purchase Agreement, the Registration Rights Agreement and the Engagement Letter are each filed as exhibits to this Quarterly Report on Form 10‑Q.