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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (22,127,000) $ (16,306,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,813,000 244,000
Depreciation expense 95,000 27,000
Reserve for uncollectible accounts   167,000
Gain on disposal of assets (45,000)  
Changes in assets and liabilities:    
Prepaid expenses and other current assets (1,013,000) 561,000
Operating lease right-of-use assets 894,000 864,000
Other assets (118,000)  
Accounts payable 345,000 (205,000)
Accrued expenses and other current liabilities (87,000) 1,734,000
Operating lease liabilities (900,000) (840,000)
Net cash used in operating activities (21,143,000) (13,754,000)
Cash flows from investing activities:    
Purchases of property and equipment (1,775,000) (211,000)
Net cash used in investing activities (1,775,000) (211,000)
Cash flows from financing activities:    
Proceeds from initial public offering, net of underwriting discount 59,892,000  
Payment of initial public offering costs (2,383,000) (226,000)
Proceeds from exercise of stock options 8,000 111,000
Net cash provided by (used in) financing activities 87,703,000 (115,000)
Net increase (decrease) in cash and cash equivalents 64,785,000 (14,080,000)
Cash and cash equivalents and restricted cash, beginning of period 10,137,000 24,217,000
Cash and cash equivalents and restricted cash, end of period 74,922,000 10,137,000
Supplemental disclosure of non-cash financing and investing activities:    
Property and equipment purchases included in accounts payable 205,000 2,000
Conversion of redeemable convertible preferred stock 160,227,000  
Accretion of redeemable convertible preferred stock to redemption value 115,000 313,000
Right-of-use asset obtained in exchange of operating lease obligation 13,000 4,046,000
Deferred offering costs included in accounts payable and accrued expense   $ 870,000
Series C Preferred Stock    
Cash flows from financing activities:    
Proceeds from the sale of Series C redeemable convertible preferred stock 30,392,000  
Payment of offering costs related to sale of Series C redeemable convertible preferred stock (206,000)  
Supplemental disclosure of non-cash financing and investing activities:    
Allocation of Series C redeemable convertible preferred stock to common stock warrant $ 740,000