Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 2,777	$ 17,909
Prepaid expenses and other assets	3,090	5,916
Assets held for sale	3	0
Total current assets	5,870	23,825
Property and equipment, net	0	4,385
Right of use assets - operating leases	684	2,040
Deferred financing costs	0	208
Total assets	6,554	30,458
Current liabilities:
Accounts payable	5,571	2,081
Accrued expenses	1,088	7,448
Deferred revenue	0	3,729
Operating lease liabilities	153	832
Finance lease liabilities	0	905
Other current liabilities	0	1,060
Total current liabilities	6,812	16,055
Deferred revenue	0	41,250
Operating lease liabilities	609	724
Finance lease liabilities	0	20
Other long-term liabilities	0	318
Total liabilities	7,421	58,367
Commitments and contingencies (Note 6)
Stockholders' deficit:
Preferred stock $0.001 par value, 5,000,000 shares authorized, none issued or outstanding
Common stock $0.001 par value, 350,000,000 shares authorized, 41,788,096 and 41,750,109 shares issued and outstanding at September 30, 2025 and December 31, 2024, respectively	41	41
Additional paid-in capital	278,994	277,629
Accumulated deficit	(279,902)	(305,579)
Total stockholders' deficit	(867)	(27,909)
Total liabilities and stockholders' deficit	$ 6,554	$ 30,458

Deferred Financing Costs, Noncurrent

No definition available.

Name:	carm_DeferredFinancingCostsNoncurrent
Namespace Prefix:	carm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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).