Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (32,228)	$ (31,737)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,155	2,130
Amortization (accretion) of premium (discount) on marketable securities	(74)	(567)
Stock-based compensation	4,224	3,514
Non-cash operating lease expense	802	754
Other	100	52
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	447	366
Other noncurrent assets	50	163
Accounts payable	1,272	(1,324)
Accrued and other current liabilities	(4,350)	(2,662)
Operating lease liabilities	(1,058)	(979)
Net cash used in operating activities	(28,660)	(30,290)
Cash flows from investing activities:
Purchases of property and equipment	(564)	(629)
Purchases of marketable securities	(23,643)	(25,798)
Proceeds from maturities of marketable securities	19,717	34,500
Other	1	(12)
Net cash (used in) provided by investing activities	(4,489)	8,061
Cash flows from financing activities:
Proceeds from issuance of common stock and pre-funded warrants in follow-on offering, net of issuance costs	46,762
Proceeds from exercise of stock options and employee stock purchase plan	8
Proceeds from exercises of pre-funded warrants	1
Payment of accrued offering costs	0	(501)
Net cash provided by (used in) financing activities	46,771	(501)
Net change in cash, cash equivalents and restricted cash	13,622	(22,730)
Cash and cash equivalents and restricted cash at beginning of period	46,363	95,671
Cash and cash equivalents and restricted cash at end of period	59,985	72,941
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	59,303	72,542
Restricted cash included in other noncurrent assets	682	399
Cash, cash equivalents and restricted cash	59,985	72,941
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued and other current liabilities	7	$ 370
Non-cash exercise of stock options	$ 3