Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (52,797)	$ (55,276)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	119	488
Change in fair value of derivative liability associated with contingently issuable warrants	(115)
Non-cash interest expense related to term loan	562	19
Stock-based compensation expense	6,627	7,395
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(754)	1,258
Accounts receivable		257
Accounts payable	(147)	1,818
Accrued expenses and other liabilities	(2,802)	(324)
Net cash used in operating activities	(49,307)	(44,365)
Cash flows from investing activities:
Proceeds from sale of property and equipment		122
Net cash provided by investing activities		122
Cash flows from financing activities:
Proceeds from stock options exercised		133
Repurchase of shares for tax withholdings		(912)
Proceeds from issuance of term loan, net of issuance costs paid to lender	10,000	14,638
Payment of debt issuance costs	(21)	(38)
Proceeds from at the market offering, net of sales commission		14,615
Payment of offering costs	(230)	(5)
Net cash provided by financing activities	9,749	28,431
Net decrease in cash, cash equivalents and restricted cash	(39,558)	(15,812)
Cash, cash equivalents and restricted cash, at beginning of period	106,321	141,299
Cash, cash equivalents and restricted cash, at end of period	66,763	125,487
Supplemental disclosure of cash flow information:
Cash paid for interest	1,415
Supplemental disclosure of non-cash investing and financing activities:
Deferred offering costs not yet paid		114
Debt issuance costs not yet paid		39
Recognition of derivative liability associated with contingently issuable warrants		287
Issuance of warrants in connection with term loan financing	$ 206	$ 255