Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (36,871)	$ (28,191)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,143	817
Loss on disposal of assets	15	0
Stock-based compensation	4,160	2,828
Non-cash interest expense related to term loan	178	0
Amortization of premium/discount on investments	69	0
Non-cash interest income	(42)	0
Changes in:
Prepaid expenses and other assets	2,283	151
Operating lease right-of-use asset	1,034	1,354
Tenant Improvement Allowance Reimbursements	4,511	0
Accounts payable	(11,142)	676
Accrued expenses and other current liabilities	(1,528)	116
Operating lease liability	(504)	711
Net cash used in operating activities	(36,694)	(21,538)
Investing activities
Purchase of property and equipment	(6,561)	(2,177)
Proceeds from sales and maturities of investments	7,676	0
Net cash provided by (used in) investing activities	1,115	(2,177)
Financing activities
Proceeds from exercise of stock options to purchase of common stock	62	347
Proceeds from purchases of common stock under employee stock purchase plan	95	0
Proceeds from borrowings under term loan, net of issuance costs	19,467	0
Proceeds from issuance of common stock, net of issuance costs	0	52,983
Net cash provided by financing activities	19,624	53,330
Increase (decrease) in cash and cash equivalents	(15,955)	29,615
Cash, cash equivalents and restricted cash at beginning of period	104,189	133,182
Cash, cash equivalents and restricted cash at end of period	88,234	162,797
Supplemental disclosure of non-cash investing and financing activities
Issuance of warrants in connection with term loan financing	567	0
Purchase of property and equipment in accrued expenses and accounts payable	$ 7,063	$ 3,878