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Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (6,334) $ (4,631)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash stock-based compensation 988 1,296
Depreciation and amortization 22 58
Gain on sale of property and equipment (346)  
Changes in operating assets and liabilities:    
Other current assets (220) (23)
Operating lease right-of-use assets and liabilities (2)  
Accounts payable 458 159
Accrued development expense (58) 621
Accrued compensation and benefits 25 (3)
Other current liabilities 85 9
Net cash used in operating activities (5,382) (2,514)
Cash flows from investing activities:    
Purchases of property and equipment   (18)
Proceeds from sale of property and equipment 360  
Net cash provided by (used in) investing activities 360 (18)
Cash flows from financing activities:    
Issuance costs from 2018 sale of common stock and warrants   (60)
Proceeds from exercise of stock options 256  
Proceeds from exercise of common stock warrants 4,940 5,866
Proceeds from follow-on public offering, net of issuance costs 70,251  
Net cash provided by financing activities 75,447 5,806
Net increase in cash and cash equivalents 70,425 3,274
Cash and cash equivalents at beginning of period 23,081 19,807
Cash and cash equivalents at end of period $ 93,506 $ 23,081