Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (177,119)	$ (101,944)	$ (87,758)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	554	427	292
Stock-based compensation	14,340	11,520	10,577
Amortization of debt-related costs	1,774	741	54
Loss on disposal of property and equipment	0	3	49
Other non-cash adjustments	(4,105)	0	0
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(982)	(14)	381
Increase in inventories	(381)	0	0
(Increase) decrease in prepaid expenses and other current assets	(2,899)	(316)	2,885
Decrease in other long-term assets	467	656	661
Increase (decrease) in accounts payable and other liabilities	6,454	76	(14,158)
Net cash used in operating activities	(161,897)	(88,851)	(87,017)
Cash flows from investing activities:
Purchases of property and equipment	(470)	(1,326)	(1,221)
Purchases of investments	(223,343)	(133,949)	(34,261)
Maturities of investments	173,870	64,197	37,592
Net cash (used in) provided by investing activities	(49,943)	(71,078)	2,110
Cash flows from financing activities:
Proceeds from issuance of common stock, net of fees	138,823	94,205	37,084
Repurchase of common stock	(824)	(864)	(2,675)
Proceeds (repayment) of debt borrowings, net of fees	49,961	48,868	(11,700)
Net cash provided by financing activities	187,960	142,209	22,709
Net decrease in cash and cash equivalents	(23,880)	(17,720)	(62,198)
Cash and cash equivalents at beginning of year	46,345	64,065	126,263
Cash and cash equivalents at end of year	22,465	46,345	64,065
Supplemental disclosure of cash flow information:
Cash paid for interest	10,057	2,289	799
Supplemental disclosure of noncash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liability	0	5,206	1,704
Issuance of equity-classified warrants	307	1,030	0
Issuance of treasury stock	0	6,321	0
Accrual of deferred financing costs	$ 250	$ 0	$ 0