Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash Flows Used in Operating Activities
Net loss		$ (22,912)	$ (34,706)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation		128	146
Accretion of discounts on investments			2
Stock-based compensation		2,155	5,339
Gain on remeasurement of the lease liability			(362)
Change in fair value of warrant liabilities	$ (2,706)	(2,706)
Transaction costs allocable to warrant liabilities	475	475
Non-cash lease expense		552	606
Changes in operating assets and liabilities:
Receivables			1,529
Prepaid expenses and other current assets		880	241
Other assets			(46)
Accounts payable		(2,660)	(460)
Accrued liabilities		(2,514)	(4,867)
Lease liability		(672)	(545)
Net cash used in operating activities		(27,274)	(33,123)	$ (66,300)
Cash Flows (Used in) Provided by Investing Activities
Proceeds from sale and maturity of investments			8,000
Purchases of property and equipment		(110)
Net cash (used in) provided by investing activities		(110)	8,000
Cash Flows Provided by Financing Activities
Proceeds from issuance of common stock and warrants from a public offering, net		8,487
Proceeds from issuance of common stock through an at-the-market offering, net		1,137	9,888
Proceeds from stock option exercises and employee stock purchase plan purchases		12	124
Net cash provided by financing activities		9,636	10,012
Net decrease in cash, cash equivalents, and restricted cash		(17,748)	(15,111)
Cash, cash equivalents, and restricted cash at beginning of period		59,807	107,586	107,586
Cash, cash equivalents, and restricted cash at end of period	$ 42,059	$ 42,059	$ 92,475	$ 59,807