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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Cash flows from operating activities:    
Net loss $ (6,409) $ (6,214)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange (gain)/loss (10) 4
Depreciation of fixed assets 73 77
Amortization of right of use asset 105 96
Compensation expense related to stock option grants and restricted stock 223 168
Gain due to the change in fair value of warrant liabilities (6)
Loss on disposal of property, plant and equipment 2
Changes in operating assets and liabilities:    
Accounts receivable 105 (934)
Contract assets 154 (96)
Other assets (499) (6)
Accounts payable (72) (138)
Accrued expenses 812 (75)
Change in lease liability (110) (96)
Contract liabilities (56) 802
Net cash used in operating activities (5,682) (6,418)
Cash flows from investing activities:    
Purchase of property, plant and equipment (41)
Net cash used in investing activities (41)
Cash flows from financing activities:    
Proceeds from Paycheck Protection Program Loan 890
Proceeds from loan payable 467
Payment of loan payable (117)
Proceeds from issuance of common stock- Aspire financing net of issuance costs 3,241
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs 6,094 746
Proceeds (costs) associated with exercise of pre-funded warrants (18)
Acquisition of treasury stock (1)
Net cash provided/ (used) by financing activities 10,575 727
Effect of exchange rate changes on cash, cash equivalents and restricted cash 27 (5)
Net increase/(decrease) in cash, cash equivalents and restricted cash 4,920 (5,737)
Cash, cash equivalents and restricted cash, beginning of period 10,930 17,159
Cash, cash equivalents and restricted cash, end of period 15,850 11,422
Supplemental disclosure of noncash operating activities:    
Prepaid financing costs reported in accrued expenses 49 67
Supplemental disclosure of noncash investing activities:    
Acquisition of property, plant and equipment through accounts payable 3
Supplemental disclosure of noncash financing activities:    
Common stock issued for payment of commitment fee $ 294