Acquisition - Summary of Changes in Carrying Value of Estimated Contingent Earn-Out Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Nov. 30, 2021	Dec. 31, 2021
Business Combinations [Abstract]
Business acquisition, earn-out payments	$ 3,800	$ 3,750
Common stock earn-out payments	$ 1,400
Settlement charge of contingent earn-out liability		$ 4,164

Settlement charge of contingent earn-out liability.

No definition available.

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