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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Operating activities:    
Net loss $ (4,284) $ (6,111)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,934 2,612
Depreciation expense 153 65
Change in fair value of warrant liability 21 (354)
Changes in operating assets and liabilities:    
Accounts receivable (58) 88
Prepaid expenses, deposits and other (96) 178
Restricted cash (2) (150)
Accounts payable (574) 43
Accrued liabilities (58) 42
Deferred revenue (168) (117)
Net cash used in operating activities (3,132) (3,704)
Investing activities:    
Purchase of property and equipment (35) (371)
Net cash used in investing activities (35) (371)
Financing activities:    
Private placement of common shares and warrants 9,195 0
Proceeds from exercise of options and warrants 0 98
Net cash provided by financing activities 9,195 98
Exchange rate effect on cash and cash equivalents 25 2
Increase in cash and cash equivalents 6,053 (3,975)
Cash and cash equivalents, beginning of period 4,716 10,457
Cash and cash equivalents, end of period $ 10,769 $ 6,482