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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (11,449) $ (7,794)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 1,129 226
Depreciation 118 93
Change in fair value of preferred stock tranche obligation   106
Accretion of premium and discounts on short-term investments 40 (16)
Changes in operating assets and liabilities:    
Prepaid expenses and other current and non-current assets 1,654 201
Accounts payable (508) (380)
Accrued research and development 741 (1,425)
Other current and non-current liabilities (989) (1,722)
Net cash used in operating activities (9,264) (10,711)
Investing activities:    
Purchases of property and equipment (136) (147)
Purchases of short-term investments (21,521)  
Maturity of short-term investments 8,000 17,000
Net cash (used in) provided by investing activities (13,657) 16,853
Financing activities:    
Proceeds from exercise of stock options 92 11
Payment of offering costs   (851)
Net cash provided by (used in) financing activities 92 (840)
Net (decrease) increase in cash and cash equivalents (22,829) 5,302
Cash and cash equivalents at beginning of period 33,418 15,870
Cash and cash equivalents at end of period 10,589 21,172
Supplemental disclosure of noncash items:    
Deferred offering costs included in accounts payable and other current liabilities   500
Property and equipment purchases included in accounts payable and other current liabilities $ 87 $ 7