Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities:
Net loss	$ (25,021)	$ (14,490)
Adjustments required to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	317	230
Stock-based compensation expense	534	857
Change in fair value of convertible debt	13,025	3,162
Non-cash interest expense	1,815
Non-cash interest income	(26)
Change in right-of-use asset	464
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,797	(1,418)
Accounts payable and accrued liabilities	(1,488)	(1,342)
Accrued compensation	180	(905)
Operating lease liability	(2,181)	(3,664)
Net cash used in operating activities	(10,584)	(17,570)
Investing activities:
Purchases of property and equipment	(250)	(2,010)
Net cash used in investing activities	(250)	(2,010)
Financing activities:
Proceeds from issuance of convertible debt, net of issuance costs		29,594
Proceeds from issuance of long-term debt, net of issuance costs	34,889
Proceeds from exercise of stock options	42
Net cash provided by financing activities	34,931	29,594
Net increase in cash and restricted cash	24,097	10,014
Cash and restricted cash, beginning of period	19,243	20,812
Cash and restricted cash, end of period	43,340	30,826
Supplemental disclosure of cash flow information:
Property and equipment included in accounts payable	425	40
Unpaid debt issuance costs	$ 26	$ 268