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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 142,350 $ 201,015
Prepaid expenses and other current assets 7,834 10,211
Total current assets 150,184 211,226
Operating lease right-of-use assets 0 122
Property and equipment, net 22,077 22,864
Intangible assets, net 268 622
Total assets 172,529 234,834
Current liabilities:    
Accounts payable and accrued expenses 9,492 4,017
Accrued development expense 7,344 2,280
Accrued compensation and benefits 187 170
Operating lease liabilities, current 0 104
Other current liabilities 391 492
Total current liabilities 17,414 7,063
Operating lease liabilities, non-current 0 35
Other non-current liabilities 0 197
Total liabilities 17,414 7,295
Commitments and contingencies (Notes 9, 10 and 11)
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized, none issued and outstanding 0 0
Common stock, $0.001 par value; 120,000,000 shares authorized; 42,129,798 and 41,735,557 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively 42 42
Additional paid-in capital 514,923 511,049
Retained Earnings (Accumulated Deficit) (359,850) (283,552)
Total stockholders' equity 155,115 227,539
Total liabilities and stockholders' equity $ 172,529 $ 234,834