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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Current assets:      
Cash and cash equivalents $ 40,947,000   $ 56,409,000
Short-term investments 30,431,000   0
Prepaid expenses and other current assets 2,244,000   3,109,000
Total current assets 73,622,000   59,518,000
Operating lease asset, net 553,000   739,000
In-process research and development 32,386,000   32,386,000
Other assets 224,000   150,000
Total assets 106,785,000   92,793,000
Current liabilities:      
Accounts payable 2,197,000   2,200,000
Current operating lease liabilities 390,000   363,000
Accrued expenses and other liabilities 2,313,000   3,912,000
Total current liabilities 4,900,000   6,475,000
Deferred tax liabilities 1,752,000   1,752,000
Non-current operating lease liabilities 184,000   383,000
Total liabilities 6,836,000   8,610,000
Commitments and contingencies (Note 8)  
Stockholders’ equity:      
Common stock, $0.001 par value, 200,000,000 shares authorized at June 30, 2023 and December, 31, 2022; 23,043,933 and 13,776,788 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively 23,000   14,000
Additional paid-in capital 323,142,000   287,034,000
Accumulated deficit (223,216,000)   (202,865,000)
Total stockholders’ equity 99,949,000 $ 74,792,000 84,183,000
Total liabilities and stockholders’ equity 106,785,000   92,793,000
Series X1 Non-voting Convertible Preferred Stock [Member]      
Stockholders’ equity:      
Preferred stock, value  
Series X Non-voting Convertible Preferred Stock [Member]      
Stockholders’ equity:      
Preferred stock, value