Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Summary Of Significant Accounting Policies [Abstract]      
Offering costs charged to stockholders' equity upon completion of offering     $ 18,047,876
Shares excluded from weighted average shares 1,031,250 1,237,500 1,031,250
Federal depository insurance coverage $ 250,000   $ 250,000