Significant Accounting Polices - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule Of Significant Accounting Policies [Line Items]
Income tax expense (benefit)	$ 0	$ 0	$ 0	$ 0
Cash and Cash Equivalents
Schedule Of Significant Accounting Policies [Line Items]
Investments in money market funds	$ 5,700,000		$ 5,700,000		$ 11,600,000