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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities:    
Net loss $ (12,413) $ (9,457)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 165 174
Stock-based compensation expense 531 230
Noncash lease expense 274 264
Noncash related party interest income (4) (3)
Noncash interest and other expense 290  
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 987 (176)
Accounts payable 5,445 (891)
Accrued expenses and other liabilities (1,197) (625)
Interest payable 89  
Operating lease liabilities (350) 363
Cash used in operating activities (6,183) (10,121)
Investing activities:    
Purchase of property and equipment (84) (37)
Repayment of note receivable 0 44
Cash (used in) provided by investing activities (84) 7
Financing activities:    
Proceeds from issuance of preferred stock 0 35,000
Payment of preferred stock issuance costs 0 (469)
Proceeds from the issuance of common stock 30,010 0
Borrowings on loan payable 15,000  
Payment of loan issuance costs (93)  
Cash acquired in connection with the reverse recapitalization 17,045  
Payment of reverse recapitalization transaction costs (6,074)  
Proceeds from option exercises 17 27
Cash provided by financing activities 55,905 34,558
Net increase in cash and cash equivalents 49,638 24,444
Cash and cash equivalents and restricted cash at beginning of period 18,820 3,244
Cash and cash equivalents and restricted cash at end of period 68,458 27,688
Supplemental disclosure of cashflow information:    
Cash paid for interest 383  
Supplemental schedule of non-cash investing and financing activities:    
Vesting of early exercise stock options $ 95 $ 200