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CONDENSED CONSOLIDATED BALANCE SHEETS UNAUDITED - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Current Assets:    
Cash and cash equivalents $ 2,336 $ 2,356
Short-term investments 0 1,991
Unbilled receivables 0 30
Prepaid expenses and other current assets 689 641
Total current assets 3,025 5,018
Restricted cash 264 264
Property and equipment, net 663 775
Right-of-use assets 1,851 1,961
Other assets 67 67
Total assets 5,870 8,085
Current Liabilities:    
Accounts payable 467 109
Accrued expenses 1,375 926
Current portion of lease liabilities 628 575
Total current liabilities 2,470 1,610
Lease liabilities, net of current portion 1,842 2,075
Convertible note payable, net of issuance costs (Note 9) 971 0
Total liabilities 5,283 3,685
Commitments and contingencies (Note 10)
Stockholders’ Equity:    
Preferred stock ($0.01 par value per share); 5,000,000 shares authorized; no shares issued or outstanding 0 0
Common stock ($0.01 par value per share); 60,000,000 shares authorized at June 30, 2023 and December 31, 2022; 6,100,263 and 4,944,202 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively 61 49
Additional paid-in capital 407,930 404,277
Accumulated other comprehensive loss (244) (229)
Accumulated deficit (407,160) (399,697)
Total stockholders’ equity 587 4,400
Total liabilities and stockholders’ equity $ 5,870 $ 8,085