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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Cash flows from operating activities:    
Net loss $ (10,352) $ (12,246)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange loss 12 55
Depreciation of fixed assets 158 180
Amortization of right of use asset 197
Compensation expense related to stock option grants and restricted stock 340 295
Gain due to the change in fair value of warrant liabilities (6) (195)
Changes in operating assets and liabilities:    
Accounts receivable (42) 108
Unbilled receivables 71
Contract assets (236) (15)
Other assets 251 325
Accounts payable (92) 23
Accrued expenses (585) (316)
Deferred rent 5
Deferred credit payable (600)
Unearned revenue (18)
Change in lease liability (201)
Contract liabilities (23) 188
Net cash used in operating activities (10,579) (12,140)
Cash flows from investing activities:    
Purchases of marketable securities (25)
Maturities of marketable securities 50
Purchase of computers, equipment and furniture (65) (54)
Net cash used in investing activities (65) (29)
Cash flows from financing activities:    
Proceeds from issuance of common stock, common and pre-funded warrants, net of issuance costs 15,712
Proceeds from issuance of common stock- Aspire financing net of issuance costs 1,021 593
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs 3,443 882
Proceeds (costs) associated with exercise of pre-funded warrants (16) 20
Payment of capital lease obligations (23)
Acquisition of treasury stock (1) (1)
Net cash provided by financing activities 4,447 17,183
Effect of exchange rate changes on cash, cash equivalents and restricted cash (32) (80)
Net decrease in cash, cash equivalents and restricted cash (6,229) 4,934
Cash, cash equivalents and restricted cash, beginning of period 17,159 12,225
Cash, cash equivalents and restricted cash, end of period 10,930 17,159
Supplemental schedule of cash flows information:    
Cash paid for interest 1
Supplemental disclosure of noncash operating activities:    
Prepaid financing costs reported in accrued expenses 7
Supplemental disclosure of noncash investing activities:    
Acquisition of computers, equipment and furniture through accounts payable 5
Supplemental disclosure of noncash financing activities:    
Common stock issued for payment of commitment fee $ 295 $ 295