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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Operating activities:    
Net loss $ (2,229) $ (1,323)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 552 739
Depreciation expense 50 54
Change in fair value of warrant liability 1,462 (285)
Changes in operating assets and liabilities:    
Accounts receivable (1,284) (55)
Prepaid expenses, deposits and other 59 (3)
Accounts payable (227) (385)
Accrued liabilities (270) (281)
Deferred revenue (254) (267)
Net cash used in operating activities (2,144) (1,806)
Investing activities:    
Purchase of property and equipment (40) (19)
Net cash used in investing activities (40) (19)
Financing activities:    
Proceeds from exercise of options and warrants 0 0
Net cash used in financing activities 0 0
Exchange rate effect on cash and cash equivalents (12) 25
Decrease in cash and cash equivalents (2,196) (1,800)
Cash and cash equivalents, beginning of period 9,561 4,716
Cash and cash equivalents, end of period $ 7,365 $ 2,916