UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities
Net loss	$ (44,005)	$ (37,650)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,066	2,140
Amortization and accretion of investments, net	(1,258)	(2,489)
Noncash lease expense	1,472	1,291
Gain on disposal of assets, including assets held for sale	(697)	(2,109)
Share-based compensation	4,059	3,541
Carrying value adjustment to assets held for sale	1,590	5,564
Changes in operating assets and liabilities:
Accounts receivable	1,200	(580)
Prepaid expenses and other assets	2,474	(5,215)
Accounts payable	457	(2,655)
Accrued expenses and other liabilities	(2,254)	(4,018)
Operating lease liabilities	(1,795)	(1,111)
Net cash used in operating activities	(34,691)	(43,291)
Cash flows from investing activities
Purchase of property and equipment	(22,003)	(10,548)
Proceeds from sale of property and equipment	1,192	4,110
Receipt of security deposit	41	0
Purchase of investments	(36,326)	(55,383)
Proceeds from sale and maturity of investments	101,026	126,686
Net cash provided by investing activities	43,930	64,865
Cash flows from financing activities
Proceeds from exercise of common stock options	0	67
Taxes paid related to net share settlement of equity awards	(588)	(393)
Repurchase of treasury stock	0	(13,982)
Net cash used in financing activities	(588)	(14,308)
Net increase in cash and cash equivalents and restricted cash	8,651	7,266
Cash and cash equivalents and restricted cash, beginning of period	9,892	21,464
Cash and cash equivalents and restricted cash, end of period	18,543	28,730
Supplemental disclosure of noncash investing and financing activities:
Repurchase of treasury stock included in accrued expenses	0	120
Acquisitions of property and equipment included in accounts payable and accrued expenses and other current liabilities	$ 950	$ 227