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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Operating activities:    
Net loss $ (5,134) $ (4,284)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,968 1,934
Depreciation expense 158 153
Change in fair value of warrant liability 1,202 21
Changes in operating assets and liabilities:    
Accounts receivable (2,623) (58)
Prepaid expenses, deposits and other 34 (96)
Restricted cash 28 (2)
Accounts payable (266) (574)
Accrued liabilities 94 (58)
Deferred revenue 981 (168)
Net cash used in operating activities (3,558) (3,132)
Investing activities:    
Purchase of property and equipment (164) (35)
Net cash used in investing activities (164) (35)
Financing activities:    
Private placement of common shares and warrants 0 9,195
Proceeds from exercise of options and warrants    0
Net cash used in financing activities 0 9,195
Exchange rate effect on cash and cash equivalents (27) 25
(Decrease) increase in cash and cash equivalents (3,749) 6,053
Cash and cash equivalents, beginning of period 9,561 4,716
Cash and cash equivalents, end of period $ 5,812 $ 10,769