Statements of Operations (Parenthetical) - USD ($)	11 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019
Income Statement [Abstract]
Shares aggregate subject to redemption	24,553,676	24,335,130
Net loss per ordinary share - basic and diluted excludes income attributable to ordinary shares subject to possible redemption	$ 1,852,344	$ 5,480,208

Amount of net loss per ordinary share basic and diluted excludes income attributable to ordinary shares subject to possible redemption.

No definition available.

Name:	GSMG_NetLossOdinaryShareExcludedSubjectToRedemption
Namespace Prefix:	GSMG_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration