Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (26,277)	$ (18,841)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,951	1,255
Depreciation expense	566	373
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	788	297
Operating lease right-of-use assets	495	467
Other assets	(949)
Accounts payable	(1,639)	743
Accrued expenses and other current liabilities	1,207	(22)
Operating lease liabilities	(524)	(481)
Deferred revenue	4,007	12,000
Net cash used in operating activities	(20,375)	(4,209)
Cash flows from investing activities:
Purchases of property and equipment	(107)	(1,785)
Net cash used in investing activities	(107)	(1,785)
Cash flows from financing activities:
Payment of deferred offering expenses	(4,010)	(146)
Proceeds from exercise of stock options	8	593
Net cash provided by financing activities	96,493	447
Proceeds from sale of common stock and pre-funded warrants	100,495
Net increase (decrease) in cash, cash equivalents and restricted cash	76,011	(5,547)
Cash, cash equivalents and restricted cash, beginning of period	46,076	74,922
Cash, cash equivalents and restricted cash, end of period	122,087	69,375
Supplemental disclosure of non-cash financing and investing activities:
Property and equipment purchases included in accounts payable	6	363
Deferred offering costs included in accounts payable and accrued expense	$ 236	$ 97