CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Cash flows from operating activities
Net loss	$ (57,188)	$ (52,048)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,956	3,147
Amortization and accretion of investments, net	(1,562)	(3,078)
Noncash lease expense	1,963	1,639
Gain on disposal of assets, including assets held for sale	(1,221)	(2,850)
Share-based compensation	5,478	4,615
Carrying value adjustment to assets held for sale	1,590	6,464
Changes in operating assets and liabilities:
Accounts receivable	1,434	(1,883)
Prepaid expenses and other assets	2,127	(5,444)
Accounts payable	(78)	(2,865)
Accrued expenses and other liabilities	(2,628)	(3,588)
Operating lease liabilities	(2,420)	(847)
Net cash used in operating activities	(46,549)	(56,738)
Cash flows from investing activities
Purchase of property and equipment	(23,740)	(16,525)
Proceeds from sale of property and equipment	2,234	5,385
Receipt of security deposit	41	0
Purchase of investments	(46,442)	(96,253)
Proceeds from sale and maturity of investments	128,837	166,886
Net cash provided by investing activities	60,930	59,493
Cash flows from financing activities
Proceeds from exercise of common stock options	2	67
Taxes paid related to net share settlement of equity awards	(672)	(412)
Repurchase of treasury stock	0	(13,982)
Net cash used in financing activities	(670)	(14,327)
Net increase (decrease) in cash and cash equivalents and restricted cash	13,711	(11,572)
Cash and cash equivalents and restricted cash, beginning of period	9,892	21,464
Cash and cash equivalents and restricted cash, end of period	$ 23,603	$ 9,892