Significant Accounting Policies - reconciliation of net loss per share (Detail) - USD ($)		2 Months Ended	3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019
Net income (loss)		$ (993)	$ 654,498	$ 596,047	$ 456,797	$ 1,707,342
Less: Income attributable to common stock subject to possible redemption			(831,541)			(2,434,928)
Adjusted Net Loss		$ (993)	$ (177,043)			$ (727,586)
Weighted average shares outstanding, basic and diluted	[1]	5,000,000	6,979,761			6,701,184
Basic and diluted net loss per common share	[2]	$ 0.00	$ (0.03)			$ (0.11)

[1] Excludes an aggregate of 21,752,975 shares subject to possible redemption at September 31, 2019. Excludes an aggregate of up to 750,000 shares subject to forfeiture if the underwriters’ option to purchase additional units was not exercised in full or in part at September 30, 2018.

[2] Net loss per share – basic and diluted excludes interest income attributable to shares subject to possible redemption of $831,541 and $2,434,928 for the three and nine months ended September 30, 2019, respectively (see Note 2).