Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents		$ 64,950	$ 50,761
Marketable securities		25,242	69,908
Accounts receivable		500	879
Prepaid expenses and other current assets		4,646	4,464
Total current assets		95,338	126,012
Restricted cash		850	1,450
Property and equipment, net		29,746	26,553
Operating lease right-of-use assets		4,762	5,261
Other assets		124	131
Total assets		130,820	159,407
Current liabilities:
Accounts payable		1,032	1,455
Accrued expenses and other current liabilities		10,817	11,354
Operating lease liabilities, current		1,733	1,916
Debt, current portion		936	1,065
Second lien loans		11,346	10,872
Total current liabilities		25,864	26,662
Debt, net of current portion		29,752	29,878
Operating lease liabilities, noncurrent		3,253	3,584
Common stock warrants		93,688	158,346
Other liabilities		996	804
Total liabilities		153,553	219,274
Commitments and contingencies (Note 8)
Redeemable convertible preferred stock		223,185	223,185
Stockholders’ deficit
Common stock, $0.0001 par value; 1,980,000 shares authorized; 177,4761 and 175,4401 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively	[1]	18	17
Additional paid-in capital		581,245	570,578
Accumulated other comprehensive income (loss)		(2)	22
Accumulated deficit		(827,179)	(853,669)
Total stockholders’ deficit		(245,918)	(283,052)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit		130,820	159,407
Series A cumulative redeemable convertible preferred stock
Current liabilities:
Redeemable convertible preferred stock		$ 223,185	$ 223,185

[1] 1 Excludes 6,250,000 shares legally issued and outstanding related to sponsor earn out securities (see Note 3).