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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Cash flows from operating activities:    
Net loss $ (14,760) $ (10,352)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange (gain)/loss (15) 12
Depreciation of fixed assets 143 158
Amortization of intangibles 6
Amortization of right of use asset 223 197
Compensation expense related to equity compensation 721 340
Gain due to the change in fair value of warrant liabilities (6)
Performance obligation shares compensation 60
Net effect from disposal of property, plant and equipment 2
Changes in operating assets and liabilities, net of acquisition:    
Accounts receivable (245) (42)
Contract assets 61 (236)
Other assets 106 251
Accounts payable 441 (92)
Accrued expenses 761 (585)
Litigation payable 1,224
Change in lease liability (237) (201)
Contract liabilities (165) (23)
Net cash used in operating activities (11,674) (10,579)
Cash flows from investing activities:    
Cash acquired in acquisition 100
Purchase of property, plant and equipment (26) (65)
Net cash provided by (used in) investing activities 74 (65)
Cash flows from financing activities:    
Proceeds from Paycheck Protection Program Loan 890
Proceeds from loan payable 467
Payment of loan payable (467)
Proceeds from stock option exercises 184
Payment of payroll taxes related to stock option exercises (245)
Proceeds from issuance of common stock- Aspire financing net of issuance costs 14,393 1,021
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs 66,166 3,443
Proceeds associated with exercise of common stock warrants 2,818
Proceeds (costs) associated with exercise of pre-funded warrants (16)
Acquisition of treasury stock (36) (1)
Net cash provided by financing activities 84,170 4,447
Effect of exchange rate changes on cash, cash equivalents and restricted cash 134 (32)
Net increase/(decrease) in cash, cash equivalents and restricted cash 72,704 (6,229)
Cash, cash equivalents and restricted cash, beginning of year 10,930 17,159
Cash, cash equivalents and restricted cash, end of year 83,634 10,930
Supplemental disclosure of noncash operating activities:    
Prepaid financing costs reported in accrued expenses 7
Supplemental disclosure of noncash investing and financing activities:    
Acquisition of property, plant and equipment through accounts payable 6
Common stock issued for payment of commitment fee 295
Issuance of stock for acquisition $ 477