Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (76,322)	$ (39,151)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	886	974
Stock-based compensation expense	2,560	2,257
Warrant issuance costs	728
Warrant liability fair value adjustment	8,981	(0)
Changes in assets and liabilities
Prepaid expenses and other assets	(962)	(2,167)
Accounts payable	6,108	157
Deferred revenue	(3,084)	1,804
Accrued and other liabilities	(3,974)	3,949
Net cash used in operating activities	(65,079)	(32,177)
Cash flows from investing activities
Purchase of property and equipment	(11)	0
Net cash used in investing activities	(11)	0
Cash flows from financing activities
Proceeds from issuance of common stock in connection with employee benefit plans	43	120
Proceeds from issuance of common stock in connection with exercise of options	0	308
Net cash provided by financing activities	59,369	31,061
Net change in cash, cash equivalents, and restricted cash	(5,721)	(1,116)
Cash, cash equivalents, and restricted cash at beginning of period	61,855	62,971
Cash, cash equivalents, and restricted cash at end of period	56,134	61,855
Supplemental disclosure of noncash items
Reclass to additional paid-in-capital upon exercise	8,590	0
Direct Offering [Member]
Cash flows from financing activities
Proceeds from issuance of common stock and common stock warrants, net of issuance costs	19,171	20,866
Private Placement [Member]
Cash flows from financing activities
Proceeds from issuance of common stock and common stock warrants, net of issuance costs	40,032	0
At-the-market Offering [Member]
Cash flows from financing activities
Proceeds from issuance of common stock in at the market offering	$ 123	$ 9,767