Summary of Significant Accounting Policies - Additional Information (Details)		6 Months Ended
	Mar. 27, 2020	Jun. 30, 2020 USD ($) Subsidary	Jun. 30, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Impairments of long-lived assets | $		$ 0	$ 0
Number of subsidiary corporations owned | Subsidary		8
Net operating loss carryback period	5 years
Net operating loss carryforwards taxable income suspension of annual deduction limitation Percentage	80.00%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Marketable securities stated maturity period		1 year