Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net loss	$ (45,083)	$ (49,609)	$ (194,900)
Adjustments to reconcile net loss to net cash flows used in operating activities:
Stock-based compensation expense	10,174	12,514
Depreciation expense	450	608
Noncash lease expense	1,147	1,102
Net (accretion) amortization of (discounts) premium on marketable securities	(1,653)	(1,566)
Changes in operating assets and liabilities:
Accounts receivable	(878)	77
Inventory	(918)	(1,258)
Prepaid expenses and other current assets	(1,967)	(4,061)
Other long-term assets	(140)	0
Accounts payable	(6,944)	993
Accrued expenses and other current liabilities	(8,196)	(7,464)
Operating lease liabilities	(857)	(791)
Net cash flows used in operating activities	(54,585)	(49,455)
Cash flows from investing activities:
Purchases of marketable securities	(20,264)	(122,860)
Maturities of marketable securities	83,041	87,021
Sales of marketable securities	0	785
Purchases of property and equipment	(146)	(360)
Net cash flows provided by (used in) investing activities	62,631	(35,414)
Cash flows from financing activities:
Proceeds from offerings of common stock, net of underwriting discounts and commissions	0	135,125
Proceeds from Warrant Exercises	9	24
Payments of Stock Issuance Costs	0	(634)
Proceeds from stock option exercises and employee stock purchase plan	513	171
Net cash flows provided by financing activities	522	134,686
Net (decrease) increase in cash and cash equivalents	8,568	49,817
Effect of exchange rate changes on cash and cash equivalents	(847)	79
Cash and cash equivalents at beginning of period	83,507	64,741	64,741
Cash and cash equivalents at end of period	$ 91,228	$ 114,637	$ 83,507