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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Operating activities:    
Net loss $ (3,297) $ (4,387)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,364 1,868
Depreciation expense 103 49
Change in fair value of warrant liability (233) (288)
Changes in operating assets and liabilities:    
Accounts receivable (43) (247)
Prepaid expenses, deposits and other 110 (52)
Restricted cash 0 (150)
Accounts payable (467) (286)
Accrued liabilities (111) (79)
Deferred revenue 20 281
Net cash used in operating activities (2,554) (3,291)
Investing activities:    
Purchase of property and equipment (28) (160)
Net cash used in investing activities (28) (160)
Financing activities:    
Proceeds from exercise of options and warrants 0 98
Net cash used in financing activities 0 98
Exchange rate effect on cash and cash equivalents 27 15
Decrease in cash and cash equivalents (2,555) (3,338)
Cash and cash equivalents, beginning of period 4,716 10,457
Cash and cash equivalents, end of period $ 2,161 $ 7,119