The number of warrants issued.

No definition available.

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- Definition

Represents the amount of overpayment balance on a debt instrument.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

The availability reserve on the line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	ater_
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Balance Type:	debit
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- Definition

The availability reserve on the line of credit facility after the reduction period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ater_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the maximum liquidity requirements at all other times on a line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	ater_
Data Type:	xbrli:monetaryItemType
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- Definition

Represents the maximum liquidity requirements during the period for a line of credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	ater_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The temporary minimum liquidity on the line of credit facility.

+ References

No definition available.

+ Details

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The temporary minimum liquidity on the line of credit facility after the delivery of a liquidity certificate.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Represents the amount of warrant liability as of balance sheet date.

+ References

No definition available.

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- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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- Definition

Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest income (expense) classified as nonoperating.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

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Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period Type:

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Period Type:

Note 8 - Credit Facility and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Mar. 01, 2022	Dec. 22, 2021	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 13, 2026	Dec. 31, 2025	Dec. 23, 2025	Dec. 22, 2025	Aug. 29, 2025	Feb. 23, 2024	Dec. 22, 2022	Mar. 31, 2022
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		16,667
Line Of Credit Facility, Maximum Liquidity Requirements During Period		$ 12,500
Line Of Credit Facility, Maximum Liquidity Requirements At All Other Times		$ 15,000
Interest Income (Expense), Nonoperating			$ (173)	$ (222)	$ (399)	$ (397)
Gain (Loss) on Extinguishment of Debt			295	$ (0)	295	$ (0)
Warrant Liability			0		0
Securities Purchase Agreement [Member] \| Private Placement [Member]
Proceeds from Issuance or Sale of Equity	$ 27,500
Seller Note [Member]
Extinguishment of Debt, Amount			300
Payment for Debt Extinguishment or Debt Prepayment Cost			38
Gain (Loss) on Extinguishment of Debt			300
Long-Term Debt			38		38
Tariff Refunds [Member]
Interest Income (Expense), Nonoperating			100		100
Share Repurchase Program Third Amendment [Member]
Share Repurchase Program, Authorized, Amount									$ 1,500	$ 1,500
Midcap Warrant [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 56.4
Warrants and Rights Outstanding, Term (Year)		10 years
Common Stock Warrant [Member] \| Private Placement [Member]
Class Of Warrant Or Right Issued In Period (in shares)														590,637
Midcap Credit Facility [Member]
Debt Issuance Costs, Net			(0)		(0)			$ 134
Long-Term Debt			0		0			$ 4,259
Line of Credit [Member] \| Midcap Credit Facility [Member]
Debt Instrument, Term (Year)		3 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 40,000										$ 30,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Line Of Credit Facility, Maximum Liquidity Requirements At All Other Times												6,800	$ 15,000
Line of Credit Facility, Current Borrowing Capacity												17,000
Line of Credit Facility, Temporary Minimum Liquidity							$ 3,500				$ 5,000
Line of Credit Facility, Temporary Minimum Liquidity After Delivery of Liquidity Certificate											6,800
Line of Credit Facility, Availability Reserve											2,800
Line of Credit Facility, Availability Reserve after Reduction Period											$ 1,000
Long-Term Line of Credit			0		0
Debt Instrument, Overpayment Balance			400		400
Debt Issuance Costs, Net			$ 100		$ 100
Line of Credit [Member] \| Midcap Credit Facility [Member] \| Term Secured Overnight Financing Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.10%
Line of Credit [Member] \| Midcap Credit Facility [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		5.50%
Asset Backed Credit Facility [Member] \| Midcap Credit Facility [Member] \| Maximum [Member]
Debt Instrument, Fee Amount												$ 100