CONSOLIDATED STATEMENTS OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Income taxes for unrealized gain on investment in convertible notes	$ (36)	$ 36

OCI, Convertible Notes, Investment, Gain (Loss), Tax

No definition available.

Name:	acel_OCIConvertibleNotesInvestmentGainLossTax
Namespace Prefix:	acel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration