Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (7,802,000)	$ (4,232,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	599,000	134,000
Depreciation expense	70,000	8,000
Changes in assets and liabilities:
Prepaid expenses and other current assets	78,000	18,000
Operating lease right-of-use assets	232,000	219,000
Accounts payable	452,000	432,000
Accrued expenses and other current liabilities	(983,000)	(381,000)
Operating lease liabilities	(236,000)	(215,000)
Net cash used in operating activities	(7,590,000)	(4,017,000)
Cash flows from investing activities:
Purchases of property and equipment	(1,160,000)	(8,000)
Net cash used in investing activities	(1,160,000)	(8,000)
Cash flows from financing activities:
Payment of deferred offering costs		(773,000)
Proceeds from exercise of stock options	262,000
Net cash provided by financing activities	262,000	29,464,000
Net (decrease) increase in cash and cash equivalents	(8,488,000)	25,439,000
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	$ 66,434,000	35,576,000
Supplemental disclosure of non-cash financing and investing activities:
Property and equipment purchases included in accounts payable		49,000
Accretion of redeemable convertible preferred stock to redemption value		85,000
Deferred offering costs included in accounts payable and accrued expense		702,000
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		(155,000)
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		$ 51,000