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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Operating activities:    
Net loss $ (6,330) $ (8,661)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense. 2,376 3,323
Income tax (benefit) expense 10 (2)
Depreciation expense. 203 105
Change in fair value of warrant liability 74 (417)
Changes in operating assets and liabilities:    
Accounts receivable 84 1
Grant receivable 0 517
Prepaid expenses, deposits and other (110) 71
Restricted cash (42) (150)
Accounts payable (472) 96
Accrued liabilities (14) 323
Deferred revenue (71) (433)
Net cash used in operating activities (4,292) (5,227)
Investing activities:    
Purchase of property and equipment (57) (519)
Net cash used in investing activities (57) (519)
Financing activities:    
Private placement of commons shares and warrants. 9,141 0
Proceeds from exercise of options and warrants 0 97
Net cash provided by financing activities 9,141 97
Exchange rate effect on cash and cash equivalents 15 (54)
Increase (decrease) in cash and cash equivalents 4,807 (5,703)
Cash and cash equivalents, beginning of year 4,754 10,457
Cash and cash equivalents, end of year $ 9,561 $ 4,754