CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Current assets:
Cash and cash equivalents	$ 12,860	$ 11,703	$ 9,601
Short-term investments	4,738	15,802
Restricted cash	200	200
Prepaid expenses and other current assets	2,766	2,555
Total current assets	20,564	30,260
Property and equipment, net	571	1,245
Operating lease right-of-use assets	17,075	19,230
Restricted cash, non-current	1,538	1,538
Long-term investments	509	4,337
Other assets	87	138
Total assets	40,344	56,748
Current liabilities:
Accounts payable	868	1,443
Accrued expenses and other current liabilities	3,089	3,717
Deferred revenue	819	449
Operating lease liabilities	3,091	2,826
Total current liabilities	7,867	8,435
Operating lease liabilities, net of current portion	18,533	20,132
Deferred revenue, non-current	1,172	1,544
Other long-term liabilities	132	132
Total liabilities	27,704	30,243
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock, $0.00001 par value; 200,000,000 shares authorized at June 30, 2026 and December 31, 2025; 1,926,345 and 1,920,566 shares issued and outstanding at June 30, 2026 and December 2025, respectively	0	0
Additional paid-in capital	488,427	487,305
Accumulated other comprehensive loss	(44)	(21)
Accumulated deficit	(475,743)	(460,779)
Total stockholders' equity	12,640	26,505	$ 38,842
Total liabilities and stockholders' equity	$ 40,344	$ 56,748

Accrued expenses and other current liabilities.

No definition available.

Name:	bolt_AccruedExpensesAndOtherCurrentLiabilities
Namespace Prefix:	bolt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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).