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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Operating activities:    
Net loss $ (5,461) $ (6,684)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,523 1,627
Depreciation expense 76 110
Provision for bad debts 34 0
Change in fair value of warrant liability 0 (781)
Changes in operating assets and liabilities:    
Accounts receivable (865) 210
Prepaid expenses and other current assets 51 (10)
Restricted cash 13 1
Accounts payable (76) 651
Accrued liabilities (90) (40)
Other non-current liability 35 0
Deferred revenue (367) (331)
Net cash used in operating activities (5,127) (5,247)
Investing activities:    
Purchase of property and equipment (44) (71)
Net cash used in investing activities (44) (71)
Financing activities:    
Payment of issuance costs related to 2015 Private Placement (18) 0
Capital lease payments (11) 0
Proceeds from exercise of options 0 2
Net cash (used in)/provided by financing activities (29) 2
Decrease in cash and cash equivalents (5,200) (5,316)
Cash and cash equivalents, beginning of period 9,357 5,891
Cash and cash equivalents, end of period $ 4,157 $ 575