Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 30,649	$ 26,495
Restricted cash	0	167
Marketable securities	73,657	157,292
Prepaid expenses and other current assets	2,684	9,666
Total current assets	106,990	193,620
Property, plant and equipment, net	0	32,509
Operating lease right-of-use assets	0	38,524
Other non-current assets	0	1,059
Total assets	106,990	265,712
Current liabilities:
Accounts payable	2,398	983
Accrued liabilities	3,662	26,883
Lease liabilities	0	7,121
Deferred revenue	0	2,651
Total current liabilities	6,060	37,638
Lease liabilities, non-current	0	38,065
Deferred revenue, non-current	0	141,471
Other liabilities, non-current	0	366
Total liabilities	6,060	217,540
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.01 par value; 200,000,000 shares authorized as of June 30, 2025 and December 31, 2024; no shares issued and outstanding as of June 30, 2025 and December 31, 2024	0	0
Additional paid-in-capital	1,072,666	1,064,454
Accumulated other comprehensive income	8	159
Accumulated deficit	(972,345)	(1,017,037)
Total stockholders' equity	100,930	48,172
Total liabilities and stockholders' equity	106,990	265,712
Common Stock Class Undefined [Member]
Stockholders' equity:
Common stock, value	347	342
Non-Voting Common Stock [Member]
Stockholders' equity:
Common stock, value	$ 254	$ 254

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).