Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (30,142)	$ (22,563)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	1,254	1,499
Accretion of marketable securities	(453)
Non-cash interest expense related to note payable	199	214
Stock-based compensation	1,984	1,147
Changes in current assets and liabilities:
Prepaid expenses and other assets	255	(1,180)
Right-of-use assets and lease liabilities, net	214	(62)
Accounts payable	(410)	495
Accrued expense and other liabilities	(1,602)	737
Deferred revenue	(566)	(3,874)
Net cash used in operating activities	(29,267)	(23,587)
Cash flows from investing activities:
Purchases of property and equipment	(705)	(838)
Purchases of marketable securities	(8,779)
Maturities of marketable securities	45,647
Net cash provided by (used in) investing activities	36,163	(838)
Cash flows from financing activities:
Proceeds from exercise of stock options	258
Net cash provided by financing activities	258
Net increase (decrease) in cash, cash equivalents and restricted cash	7,154	(24,425)
Cash, cash equivalents, and restricted cash - beginning of period	138,390	125,064
Cash, cash equivalents, and restricted cash - end of period	145,544	100,639
Summary of cash, cash equivalents and restricted cash reported within the consolidated balance sheets:
Cash and cash equivalents	140,513	95,608
Restricted cash	5,031	5,031
Total cash, cash equivalents, and restricted cash	145,544	100,639
Supplemental disclosure of cash flow information:
Cash paid for interest	758	743
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment in accounts payable and accrued liabilities	$ 309	$ 24