Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net loss	$ (48,681)	$ (26,488)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	227	217
Stock-based compensation	5,260	3,151
Non-cash interest expense	193	210
Amortization (accretion) of premiums/discounts on investments, net	320	(91)
Amortization of right-of-use asset	502	463
Change in fair value of warrant liability		75
Changes in operating assets and liabilities
Prepaid expenses and other current assets	1,995	29
Accounts payable and accrued liabilities	5,407	(1,260)
Lease liability	(549)	(427)
Net cash used in operating activities	(35,326)	(24,121)
Investing activities:
Purchases of property and equipment	(8)	(172)
Purchases of short-term investments	(39,176)	(7,944)
Sales and maturities of short-term investments	65,941	37,033
Net cash provided by investing activities	26,757	28,917
Financing activities:
Proceeds from issuance of common stock from initial public offering, net of issuance costs		77,750
Proceeds from exercise of common stock options	1,096	69
Repurchase of unvested common stock	(1)	(2)
Deferred issuance costs	(37)
Proceeds from issuance of common stock from employee stock purchase plan	147
Net cash provided by financing activities	1,205	77,817
Net (decrease) increase in cash and cash equivalents	(7,364)	82,613
Cash and cash equivalents at beginning of period	24,393	15,668
Cash and cash equivalents at end of period	17,029	98,281
Supplemental disclosure of cash flow information:
Cash paid for interest	552	554
Supplemental non-cash investing and financing activities:
Conversion of convertible preferred stock to common stock		122,465
Conversion of convertible preferred stock warrant to common stock warrant		259
Issuance costs in accounts payable and accrued liabilities	401	852
Vesting of common stock	$ 20	$ 73