Name:	atmr_CommitmentsAndContingenciesLineItems
Namespace Prefix:	atmr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the deferred fee per unit.

No definition available.

Name:	atmr_DeferredFeePerUnit
Namespace Prefix:	atmr_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The carrying value as of balance sheet date of underwriting compensation deferred, classified as noncurrent.

No definition available.

Name:	atmr_DeferredUnderwritingCompensationNoncurrent
Namespace Prefix:	atmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Reverse Recapitalization, Pro Forma Equity

No definition available.

Name:	atmr_ReverseRecapitalizationProFormaEquity
Namespace Prefix:	atmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.