Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (29,896,000)	$ (15,106,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,988,000	1,221,000
Depreciation expense	723,000	54,000
Gain on disposal of assets		(45,000)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,431,000)	(1,689,000)
Operating lease right-of-use assets	705,000	666,000
Accounts payable	1,167,000	141,000
Accrued expenses and other current liabilities	966,000	150,000
Operating lease liabilities	(731,000)	(667,000)
Deferred revenue	11,986,000
Net cash used in operating activities	(14,523,000)	(15,275,000)
Cash flows from investing activities:
Purchases of property and equipment	(2,302,000)	(674,000)
Net cash used in investing activities	(2,302,000)	(674,000)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts		59,892,000
Payment of initial public offering costs		(2,383,000)
Payment of deferred offering expenses	(241,000)
Proceeds from exercise of stock options	604,000	1,000
Net cash provided by financing activities	363,000	87,696,000
Net (decrease) increase in cash and cash equivalents	(16,462,000)	71,747,000
Cash and cash equivalents and restricted cash, beginning of period	74,922,000	10,137,000
Cash and cash equivalents and restricted cash, end of period	58,460,000	81,884,000
Supplemental disclosure of non-cash financing and investing activities:
Property and equipment purchases included in accounts payable	1,049,000	17,000
Conversion of redeemable convertible preferred stock		160,227,000
Accretion of redeemable convertible preferred stock to redemption value		115,000
Right-of-use asset obtained in exchange of operating lease obligations		13,000
Deferred offering costs included in accounts payable and accrued expense	$ 4,000
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
Series C redeemable convertible preferred stock stock issuance costs included in accounts payable and accrued expense		$ 1,000