Condensed Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net loss	$ (32,609)	$ (53,413)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and accretion	176	251
Impairment loss on property and equipment and intangible asset		1,185
Stock-based compensation	3,012	331
Issuance of Series C redeemable convertible preferred stock for license		13,121
Payment for MAU868 asset purchase	5,000
Restructuring payments	(999)	(2,423)
Non-cash interest expense on convertible notes		134
Issuance costs for convertible notes		23
Gain on issuance of convertible notes		(63)
Gain on sale of PNAi technology	(2,691)
Change in fair value of convertible notes		1,076
Change in fair value of non-marketable equity securities	892
Changes in operating assets and liabilities:
Prepaid expense and other current assets	(2,306)	(135)
Other assets	(51)	59
Accounts payable	475	567
Accrued and other current liabilities	5,393	110
Other liabilities		(478)
Net cash used in operating activities	(23,708)	(34,809)
Cash flows from investing activities
Proceeds from sale of PNAi technology	796
Payment for MAU868 asset purchase	(5,000)
Purchase of property and equipment		(99)
Proceeds from the sale of property and equipment		57
Net cash provided by (used in) investing activities	(4,204)	(42)
Cash flows from financing activities
Proceeds from exercise of stock options	550	230
Proceeds from Issuance of Series C Redeemable Convertible Preferred Stock		80,000
Payment of issuance costs related to issuance of redeemable convertible preferred stock		(389)
Proceeds from issuance of convertible notes		5,602
Proceeds from issuance of Class A common stock upon initial public offering, net of underwriting discounts and commissions	51,176
Proceeds from borrowings, net of costs	4,921
Payment of offering costs related to initial public offering	(2,765)
Payment of issuance costs related to convertible promissory notes		(23)
Payment on capital lease obligations		(130)
Net cash provided by financing activities	53,882	85,290
Net increase (decrease) in cash and cash equivalents and restricted cash	25,970	50,439
Cash, cash equivalents and restricted cash, beginning of year	53,997	3,558
Cash, cash equivalents and restricted cash, end of year	79,967	53,997
Supplemental disclosure of cash flow information
Cash paid for interest	17	32
Issuance of Series C redeemable convertible preferred stock for license		13,121
Issuance of Series C redeemable convertible preferred stock upon extinguishment of convertible notes		5,736
Receivable on Exercise of Stock Options		52
Reclassification of redeemable convertible preferred stock into common stock upon initial public offering	139,576
Non-marketable equity securities received as partial proceeds from sale of PNAi technology	1,759
Lease assignment	136
Liability assumed in connection with MAU868 asset purchase	2,000
Cash and cash equivalents [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, beginning of year	53,654
Cash, cash equivalents and restricted cash, end of year	79,674	53,654
Restricted cash [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, beginning of year	343
Cash, cash equivalents and restricted cash, end of year	$ 293	$ 343