Investment Held in Trust Account (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Jun. 30, 2018
Cash and Cash Equivalents [Line Items]
Investment held in trust account, carrying value	$ 209,362,389	$ 206,785,848
Gross Unrealized Holding Loss	(44,084)	(70,639)
Investment held in trust account, fair value	209,318,305	206,715,209
U.S. Money Market [Member]
Cash and Cash Equivalents [Line Items]
Investment held in trust account, carrying value		8,940
Gross Unrealized Holding Loss
Investment held in trust account, fair value		8,940
U.S. Treasury Securities [Member]
Cash and Cash Equivalents [Line Items]
Investment held in trust account, carrying value	209,362,019	206,776,908	$ 209,362,019
Gross Unrealized Holding Loss	(44,084)	(70,639)
Investment held in trust account, fair value	209,317,935	$ 206,706,269
Cash [Member]
Cash and Cash Equivalents [Line Items]
Investment held in trust account, carrying value	370
Investment held in trust account, fair value	$ 370