Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (11,911,000)	$ (7,802,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	844,000	599,000
Depreciation expense	280,000	70,000
Changes in operating assets and liabilities:
Collaboration revenue receivable	(5,000,000)
Prepaid expenses and other current assets	371,000	78,000
Operating lease right-of-use assets	246,000	232,000
Other assets	(260,000)
Accounts payable	(663,000)	452,000
Accrued expenses and other current liabilities	(87,000)	(983,000)
Operating lease liabilities	(257,000)	(236,000)
Deferred revenue	4,532,000
Net cash used in operating activities	(11,905,000)	(7,590,000)
Cash flows from investing activities:
Purchases of property and equipment	(93,000)	(1,160,000)
Net cash used in investing activities	(93,000)	(1,160,000)
Cash flows from financing activities:
Payment of deferred offering expenses	(2,000)
Proceeds from exercise of stock options	8,000	262,000
Net cash provided by financing activities	6,000	262,000
Net decrease in cash and cash equivalents	(11,992,000)	(8,488,000)
Cash and cash equivalents and restricted cash, beginning of period	46,076,000	74,922,000
Cash and cash equivalents and restricted cash, end of period	34,084,000	$ 66,434,000
Supplemental disclosure of non-cash financing and investing activities:
Deferred offering costs included in accounts payable and accrued expense	$ 68,000