Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (16,859)	$ (13,764)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	637	499
Share-based compensation	2,229	302
Change in fair value of warrant liability		5,549
Deferred rent	(8)	(1)
Forgiveness of PPP Loan	(500)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,819)	(151)
Accounts payable	2,088	999
Accrued expenses and other current liabilities	2,811	495
Net cash used in operating activities	(11,421)	(6,072)
Cash flows from investing activities:
Purchases of property and equipment	(65)	(540)
Net cash used in investing activities	(65)	(540)
Cash flows from financing activities:
Proceeds from sale of Series A convertible preferred stock		11,046
Payment of Series A convertible preferred stock issuance costs		(27)
Proceeds from sale of common stock and common stock warrants	27,225
Payment of issuance costs related to the sale of common stock and common stock warrants	(559)
Proceeds from exercise of stock options	74	7
Proceeds from exercise of stock warrants	1,338
Payment of IPO costs		(309)
Payment of offering costs	(18)
Proceeds from long-term debt		500
Payment of equipment loan payable	(97)	(165)
Payment of capital lease obligations		(239)
Net cash provided by financing activities	27,963	10,813
Net increase in cash and restricted cash	16,477	4,201
Cash and restricted cash at beginning of period	39,866	2,643
Cash and restricted cash at end of period	56,343	6,844
Supplemental disclosures of cash flow information:
Cash paid for interest		27
Supplemental disclosures of non-cash investing and financing activities:
Fair value of liability-classified warrants issued in connection with Series A convertible preferred stock		1,522
Series A convertible preferred stock warrants issuance costs in accounts payable		22
IPO costs included in accounts payable and accrued expenses and other current liabilities		$ 2,221
Purchases of property and equipment in accounts payable	2
Offering costs in accrued expenses	$ 289