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Consolidated Balance Sheets - USD ($)
Oct. 31, 2020
Apr. 30, 2020
Current assets:    
Cash and cash equivalents $ 15,244,000 $ 10,002,000
Restricted cash, short-term 384,000 707,000
Accounts receivable 105,000
Contract assets 97,000 251,000
Other current assets 1,129,000 588,000
Total current assets 16,854,000 11,653,000
Property and equipment, net 425,000 499,000
Right-of-use asset, net 1,060,000 1,165,000
Restricted cash, long-term 222,000 221,000
Total assets 18,561,000 13,538,000
Current liabilities:    
Loan payable 350,000
Accounts payable 148,000 220,000
Accrued expenses 2,215,000 1,353,000
Contract liabilities, current portion 109,000 100,000
Right-of-use liability, current portion 244,000 229,000
Warrant liabilities
Paycheck protection program loan- current 396,000
Total current liabilities 3,462,000 1,902,000
Paycheck protection program loan, less current portion 495,000
Right-of-use liability, less current portion 954,000 1,078,000
Contract liabilities, less current portion 65,000
Total liabilities 4,911,000 3,045,000
Commitments and contingencies (Note 16)
Stockholders' Equity:    
Preferred stock, $0.001 par value; authorized 5,000,000 shares,none issued or outstanding
Common stock, $0.001 par value; authorized 100,000,000 shares, issued 24,153,554 and 12,939,420 shares, respectively 24,000 13,000
Treasury stock, at cost; 4,251 shares (302,000) (302,000)
Additional paid-in capital 240,648,000 231,101,000
Accumulated deficit (226,545,000) (220,136,000)
Accumulated other comprehensive loss (175,000) (183,000)
Total stockholders' equity 13,650,000 10,493,000
Total liabilities and stockholders' equity $ 18,561,000 $ 13,538,000