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Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended 554 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES      
Net Loss $ (2,245,272) $ (3,586,542) $ (119,289,356)
Adjustments to reconcile net loss to net cash used in operating activities      
Depreciation and amortization 37,300 37,091 2,256,912
Amortization of deferred compensation       336,750
Interest on debt instruments 628,321 1,925,352 44,180,647
Loss on debt settlement and extinguishment       163,097
Loss on impairment, disposal and write down of long-lived assets       826,846
Issuance and vesting of compensatory stock options and warrants 34,071 18,242 8,408,999
Issuance of common stock below market value       695,248
Issuance of common stock as compensation 13,261 75,405 881,051
Issuance of common stock for services rendered       1,265,279
Issuance of note payable for services rendered       120,000
Contributions of capital through services rendered by stockholders       216,851
Changes in operating assets and liabilities      
Accounts receivable, prepaid expenses and other assets 679,044 (168,034) (360,240)
Inventory 268 (35,161) 210,786
Accounts payable and accrued liabilities (710,135) 120,769 1,302,153
Net cash used in operating activities (1,563,142) (1,612,878) (58,784,977)
CASH FLOWS FROM INVESTING ACTIVITIES      
Purchase of property and equipment    (12,719) (1,778,942)
Proceeds from the sale of property and equipment       8,307
Capitalization of patent costs and license rights (33,156) (21,409) (1,930,084)
Net cash used in investing activities (33,156) (34,128) (3,700,719)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from sale of common stock and exercise of stock options and warrants, net of related expenses and payments       44,478,293
Repurchase of outstanding warrants       (3,216,520)
Proceeds from stockholder notes payable       977,692
Proceeds from issuance of notes payable, net of issuance costs       7,621,192
Proceeds from convertible notes, net of issuance costs       13,321,447
Proceeds for issuance of convertible preferred stock 4,920,183 2,500,000 12,771,333
Payments on notes - short-term (34,372) (41,736) (1,394,700)
Payments on notes - long-term       (8,000,000)
Net cash provided by financing activities 4,885,811 2,458,264 66,558,737
Net change in cash and cash equivalents 3,289,513 811,258 4,073,041
Cash and cash equivalents, beginning of period 783,528 1,879,872 783,528
Cash and cash equivalents, end of period 4,073,041 2,691,130 4,073,041
Cash paid for:      
Interest 27,483 551 294,909
Income taxes       $ 27,528
Non-cash financing activities:      
Restricted stock issued during period in payment of convertible notes

 The Company issued 4,123 shares of restricted common stock for the payment of interest accrued on convertible notes. The shares were issued at a conversion price of $45.10 for the payment of $185,917 interest payable on convertible notes with a gross carrying value of $4,900,000.

 The Company issued 4,123 shares of restricted common stock for the payment of interest accrued on convertible notes. The shares were issued at a conversion price of $45.10 for the payment of $185,917 interest payable on convertible notes with a gross carrying value of $4,900,000.

  
Common stock issued upon coversion of convertible preferred stock

The Company issued 120,944 shares of its common stock for payment of $226,560 of dividends to the series C convertible preferred stock.
The Company issued 61,713 shares of its common stock to redeem 1,835 shares of convertible preferred stock with a fair value of $2,180,218.